Installing floors

I have a 71 duster 340 outer body is perfect needs floors. I am capable and have the tools. Just need some guidence.
How, or should I make any preparations, structuraly before I actualy remove the floors. Right now the car is complete, all body parts are still installed. The car will be disassembled at some point. The car will get frame connectors most likley home made. I do have a rotisserie as well.
One thought I had was to install the connectors before I do anything else, then disassemble, drop the k-member, rear suspention. I am not stripping the car to bare metal as any plastic work done was done 30 years ago and is still perfect, although I want to strip off the current yellow paint and repaint the original black. I am not looking to do a full blown resto, lifes to short and the car isnt worth it from a $$$ stand point.
I appreciate any constructive input