Truck cab question

Yeah I know, I'll have to get some
I'm pretty much sure that I can make something work now with what I have on hand... I've been looking at Google at what other people have done to fix their roof rot... from surgery to splice in a section of another roof to replacing a skin (looks like Mopar parts giant might still have a few actually) most I see have used a junkyard donor skin) to cutting the pillars in the middle of the window openings and splicing there... at the moment I'm liking the thought of using the military cab and seeing if I can get it filled in not with Bondo not with fiberglass but with real actual lead.