Help with frame jig design please

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I'm building a frame jig for an old mustang.I have a few questions that I hope someone here can help me with:The first design would be to make a box structure using 2"x4" (1/8 thickness) steel tube...2x 10ft by 4ft rectangles connected by 6x 1ft "legs".The second design is to use 2x lengths of 10ft by 2” x 6” tube with 3x connecting ribs (2” x 6”)  (all 1/8th inch thickness). Which one would be better?I'm thinking the 2 x 6 design would be better as there would be less welding and therefore less chance for warping. I know these old cars were horrible in terms of body panel fitment but i would like to get this jig capable of at least 1/4 accuracy, so stiffness is the goal here. Lastly the Jig will have 6 leveling screws (on each corner and 2 on center).Any advice?
Reply:These cars were all uni-body construction, were they not? What is your purpose or this jig? If you are trying to straighten a uni-body, then your materials are way too light. If you are trying to level out the body while you put on teh other panels I'd just level it with screw jacks.
Reply:Its a little of both. the car was repaired (it was badly dented from a car pulling out of a parking spot next to the mustang) but the new body panels were welded on very poorly and are 1/2 to 1 inch off on the bumper and left rear quarter panel. i would like to be able to lock a few major points on the car to the correct datum line so i can be sure that the new panels are going on correctly. So the jig will not be for straightening out the car but to act more as a cast or "locked-on" reference plain.Last edited by 1967marti; 07-19-2012 at 10:35 PM.Reason: na