Bracing shell on rotisserie?

[Boerger]

I have a 70 camaro tore down to the shell on a rotisserie. I need to replace the full quarters on each side, both rockers, and both floorboards. I was planning to do the floors first, then the rockers, then the quarters, but I wasn't sure how to brace up the car. Will a bar across the door openings and a bar from the firewall to rear panel be enough?

Thanks in advance
Chris