Cab floor rust repair tips?

[evan]

I'm disassembling my truck at my friend's shop and was thinking about bringing the cab to my garage to do the rust repair. My plan was to blast and prime it before replacing the rusted bits.

Do I need to be able to place it back on the frame while doing the rust repair to keep it square or should I be able to do all the repair in my garage without the frame?

Also, do any of you have any favorite how-to's or threads that detail the process of repairing a rusted cab the right way?

Here's a picture of what used to be the passenger side floor support.