ya did it fine [but you coulda posted in the general forum], and good luck with the project - always good to see another TF resurrected
I think the cab backs are prolly good quality, being from the same place as the new doors, but I'd get the bed off and make sure you need that much, might be able to straighten a lot of it and use smaller patches, like just the lower corners
for starters, use epoxy primer on everything [maybe ZeroRust or POR on the frame], for the long term, and to protect the work as you go until there's enuff done to use paint .... also prime behind panels and inside spaces as much as possible or use a good rust inhibiter
Bill