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A manufacturing system includes a configurable positioning apparatus and machining system for processing a workpiece retained by the positioning apparatus. The positioning apparatus has different configurations for retaining different types of workpieces, such as panels, fuselages, airfoil skins, an

A manufacturing system includes a configurable positioning apparatus and machining system for processing a workpiece retained by the positioning apparatus. The positioning apparatus has different configurations for retaining different types of workpieces, such as panels, fuselages, airfoil skins, and engine housings. The positioning apparatus includes a first support rail and a second support rail spaced apart from the first support rail. The first and second support rails support a plurality of stackable headers that cooperate to position the workpiece. The headers have adjustable heights along their lengths in order to accommodate the shape of the workpiece.

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1. A system for supporting a workpiece, comprising: a first support rail having a plurality of discrete first mounting regions;a second support rail having a plurality of discrete second mounting regions, the second mounting regions and corresponding first mounting regions defining a plurality of tr

1. A system for supporting a workpiece, comprising: a first support rail having a plurality of discrete first mounting regions;a second support rail having a plurality of discrete second mounting regions, the second mounting regions and corresponding first mounting regions defining a plurality of transverse mounting positions;a receiving window between the first support rail and the second support rail;a header dimensioned to rest on the first support rail and the second support rail and to support at least a portion of a workpiece, the header comprising: a beam,a panel of actuators fixedly coupled to the beam such that free ends of the actuators are movable away from and towards the beam, anda first locking mechanism at a first end of the header and a second locking mechanism at a second end of the header opposing the first end, the first and second locking mechanisms coupleable to a pair of the first and second mounting regions to keep the header at one of the transverse mounting positions when the first and second locking mechanisms are in locked configurations, the header being movable with respect to the first support rail and the second support rail when the first locking mechanism and the second locking mechanism are in unlocked configurations; andat least one cover supported by the first support rail and the second support rail to fill substantially all of a gap between an adjacent pair of the headers. 2. The system of claim 1, wherein the header is adapted to be lifted vertically away from the first support rail and the second support rail when the first and second locking mechanisms are in the unlocked configurations. 3. The system of claim 1, wherein the panel of actuators extends through the beam. 4. The system of claim 1, wherein the panel of actuators is substantially perpendicular to at least one of a longitudinal axis of the first support rail and a longitudinal axis of the second support rail. 5. The system of claim 1, wherein each of the actuators is independently movable along respective lines of action extending through the receiving window. 6. The system of claim 1, wherein the header includes at least one stationary holder that cooperates with the panel of actuators to support the workpiece or couple to a tool. 7. The system of claim 6, wherein the at least one stationary holder is an elongate rod or an arch with a platform. 8. The system of claim 1, wherein at least one of the first and second locking mechanisms includes a locating pin configured to pass through one of the first and second mounting regions. 9. The system of claim 1, wherein the beam has an axial length sufficiently long such that the first end and the second end of the beam overlay the first support rail and the second support rail, respectively. 10. The system of claim 1, wherein the first mounting regions are formed in an upper surface of the first support rail and the second mounting regions are formed in an upper surface of the second support rail. 11. The system of claim 1, further comprising: a plurality of headers adapted to be positioned at corresponding transverse mounting positions and dimensioned to rest on the first support rail and the second support rail. 12. The system of claim 1, wherein at least one of the actuators is movable between laterally offset positions with respect to a longitudinal axis of the beam. 13. The system of claim 1, wherein at least one of the actuators has a mounting plate adapted to mate with a mounting region of the beam to define a plurality of preset actuator mounting positions. 14. A system for supporting a workpiece, comprising: a first support rail having a plurality of discrete first mounting regions;a second support rail having a plurality of discrete second mounting regions, the second mounting regions and corresponding first mounting regions defining a plurality of transverse mounting positions;a receiving window between the first support rail and the second support rail; anda header dimensioned to rest on the first support rail and the second support rail and to support at least a portion of a workpiece, the header comprising: a beam,a panel of actuators fixedly coupled to the beam such that free ends of the actuators are movable away from and towards the beam,a first locking mechanism at a first end of the header and a second locking mechanism at a second end of the header opposing the first end, the first and second locking mechanisms coupleable to a pair of the first and second mounting regions to keep the header at one of the transverse mounting positions when the first and second locking mechanisms are in locked configurations, the header being movable with respect to the first support rail and the second support rail when the first locking mechanism and the second locking mechanism are in unlocked configurations, anda sealing device configured to form a seal with another component movable with respect to the header. 15. The system of claim 14, wherein the sealing device is an inflatable bladder seal extending lengthwise along the beam. 16. A manufacturing system for processing a workpiece, the system comprising: a stationary frame having a first support rail and a second support rail, the first support rail including a plurality of spaced apart discrete first mounting regions formed therein, the second support rail including a plurality of spaced apart discrete second mounting regions formed therein, and corresponding transverse pairs of the first mounting regions and second mounting regions defining installation positions;a plurality of headers positionable at respective ones of the installation positions, each of the headers including a row of movable actuators adapted to support at least a portion of a workpiece processed by a machining system; andat least one cover supported by the first support rail and the second support rail to fill substantially all of a gap between an adjacent pair of the headers. 17. The manufacturing system of claim 16, wherein each of the headers is configured to be fixedly coupled to a corresponding pair of the first and second mounting regions. 18. The manufacturing system of claim 16, wherein at least one of the headers includes a beam that extends transversely between and rests upon the first support rail and the second support rail. 19. The manufacturing system of claim 16, wherein each header includes a locking mechanism having a locked state for fixedly coupling to the frame and an unlocked state for moving with respect to the frame. 20. The manufacturing system of claim 16, wherein at least one of the headers has a beam and an actuator mountable at a plurality of preset mounting positions with respect to the beam, the preset mounting positions between adjacent headers. 21. The manufacturing system of claim 16, wherein at least one of the headers has an elongate member and an actuator that includes a mounting plate adapted to mate with a mounting region of the elongate member to define a plurality of preset actuator mounting positions. 22. The manufacturing system of claim 16, wherein the at least one cover is sufficiently wide to define a walkway. 23. The manufacturing system of claim 16, comprising a plurality of covers each having a width that is generally equal to or a multiple of half a width of one of the headers. 24. A manufacturing system for processing a workpiece, the system comprising: a stationary frame having a first support rail and a second support rail, the first support rail including a plurality of spaced apart discrete first mounting regions formed therein, the second support rail including a plurality of spaced apart discrete second mounting regions formed therein, and corresponding transverse pairs of the first mounting regions and second mounting regions defining installation positions;a plurality of headers positionable at respective ones of the installation positions, each of the headers including a row of movable actuators adapted to support at least a portion of a workpiece processed by a machining system; anda cover between an adjacent pair of components to shield a space generally beneath the adjacent components from water and debris as a workpiece is processed. 25. The manufacturing system of claim 24, wherein the cover forms a fluid tight seal with at least one of the adjacent components that is in the form of a header. 26. A manufacturing system for processing a workpiece, the system comprising: a stationary frame having a first support rail and a second support rail, the first support rail including a plurality of spaced apart discrete first mounting regions formed therein, the second support rail including a plurality of spaced apart discrete second mounting regions formed therein, and corresponding transverse pairs of the first mounting regions and second mounting regions defining installation positions; anda plurality of headers positionable at respective ones of the installation positions, each of the headers including a row of movable actuators adapted to support at least a portion of a workpiece processed by a machining system, the plurality of headers being connected to one another to form fluid tight seals between one another. 27. The manufacturing system of claim 16, wherein one of the headers includes an inflatable sealing device adapted to engage an adjacent header or cover. 28. A system for positioning a workpiece, the system comprising: a first support rail;a second support rail spaced apart from the first support rail, the first support rail and the second support rail defining a plurality of discrete mounting positions located along longitudinal lengths of the first support rail and the second support rail; anda plurality of elongate upright headers independently movable along the lengths of the first support rail and the second support rail and fixedly coupleable to the first support rail and the second support rail at respective ones of the discrete mounting positions, each of the headers adapted to rest on the first support rail and the second support rail; andat least one cover supported by the first support rail and the second support rail to fill substantially all of a gap between an adjacent pair of the headers. 29. The system of claim 28, wherein at least one of the headers includes a locking mechanism having a locked configuration for fixedly coupling to one of the first and second support rails and an unlocked configuration for allowing the header to move with respect to the one of the first and second support rails. 30. The system of claim 28, wherein one of the headers has a panel of actuators with a fixed length, each of the actuators has a raised configuration and a lowered configuration to adjust a height of the panel of actuators. 31. The system of claim 28, wherein at least one of the headers has a plurality of actuators, and top surfaces of the first and second support rails are positioned vertically midway along the plurality of actuators. 32. The system of claim 28, wherein at least one of the headers has at least one upright movable actuator and at least one fixed height support component that cooperates with the at least one upright movable actuator to support the workpiece. 33. The system of claim 28, wherein the plurality of elongate upright headers are horizontally stackable along the first and second support rails. 34. A method of processing a workpiece using the manufacturing system of claim 16, the method comprising: positioning the plurality of headers on the plurality of first mounting regions of the first support rail and the plurality of second mounting regions of the second support rail such that the plurality of headers extend transversely between the first support rail and the second support rail;fixedly coupling the headers to the first and second support rails using locking mechanisms of the headers such that each locking mechanism is received by one of the first and second mounting regions;positioning the cover between the adjacent pair of headers to fill substantially all of the gap therebetween;placing a workpiece on the actuators of the headers;processing the workpiece using a movable machining assembly;removing the processed workpiece from the actuators; anddecoupling one of the headers from the first and second support rails using the locking mechanisms. 35. The method of claim 34, further comprising: moving at least one of the headers with respect to the first and second support rails after decoupling the header from the first and second support rails. 36. The method of claim 34, wherein positioning the plurality of headers further comprises horizontally stacking the plurality of headers along the first and second support rails. 37. The method of claim 34, wherein placing the workpiece on the actuators further includes positioning the workpiece on panels formed of rows of the actuators. 38. The method of claim 34, further comprising: eccentrically positioning at least one of the actuators with respect to a beam of one of the headers supporting the at least one actuator. 39. The method of claim 34, further comprising: moving one of the actuators from a first mounting position to a second mounting position while the actuator extends through a beam of the header that supports the actuator in the first and second mounting positions. 40. The method of claim 34, further comprising: engaging at least one pair of adjacent headers to produce a water and/or debris resistant barrier. 41. The method of claim 40, further comprising: compressing a sealing device between the at least one pair of adjacent headers.