The car is a 1972 Challenger that is currently blown apart and on a rotisserie. When I'm not working on the car I flip it right side up and let it rest on a "table" made out of 2x4's (torsion bar cross member and rear frame rails at spring mounts) to help alleviate any sag or twist.

I have the US Car Tool E-Body kit which includes sub frame connectors, inner fender braces, torque boxes, and core support brace. I want to be very careful and make sure everything is square and plumb before I tack the parts in place. My plan is to create four legs that can be independently leveled and bolt them to the floor at the appropriate locations. I am planning on using the locating holes in the torsion bar cross member and locating holes in the rear frame rails as reference points/mounts. Leveling the car side to side is pretty straight forward but I am not sure where is the best place to check the car for level front to back.

After I have the car squared and leveled my plan is to install the doors and check the gaps, tack the pieces in place, then off with the doors and back on to the rotisserie for final welding.

I am open to any and all comments and suggestions as to what is the best way to proceed as this is my first build of this magnitude. I also have a frame chart with dimensions in a restoration guide that I inherited with the car but would love another reference if anyone has one to share.

Thanks!
Randy