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If you're going to tackle chassis building or modifications, you'll need a jig or table of some kind, as the heat generated during the welding will cause the frame to twist and warp unless it's clamped to something solid. The jig needs to be of heavier-gauge steel than the frame it's supporting, otherwise the jig will warp along with the chassis. I use this dolly for moving and painting bodyshells and it's ideal for our purposes here while tack-welding the frame, though either something more substantial will be needed for final welding or I shall attach the dolly to something heavy like the chassis dyno ramps in the background! Before any work could commence, the chassis was measured to ensure it was square, level, and central on the jig.