I’d definitely do your panel and torque box work off the rotisserie while on multiple (4-8) jack stands or better yet, a chassis jig. I’ve got a rotisserie that I picked up a few months ago I’m dying to get the car on but for the time being while I chop and repair major pieces I’m leveled on jack stands and have pages worth of measurements written down in a notebook so I can match after. I haven’t welded in any supports yet because I’ve tried to plan each repair so that other parts remain supported. So far, so good. Good luck with your restoration!
-Tom