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My '68 went through a bare-metal restoration which included a lot of time on a rotisserie. You can see the thread "Ricky Camaro Rebuild" in this area for the entire story. My car had survived a major front-end collision prior to my purchase, and the subframe was not rebuildable (that means a replacement was less expensive than the labor it would have taken). Therefore, it went on the rotisserie only after the body from firewall forward was removed, so your question was, in my case, not a consideration. Life in the early stages of rotisserie time looked like this:
Ultimately, both rear quarters, the passenger inner tub, and the pan from front of trunk to firewall was replaced. Front sheetmetal was left off until the car became once again a roller. Even then, only the parts needed to support items needed for "first fire" of the 396 were put in place, such as core support, etc. At the time of first-fire, only the front skirts were in place, to support a complete new wiring slice of the restoration.
Not sure if this helps, since your work might not prove as extensive as mine. i.e., YMMV.