Great, so obviously, keep the Engine & Tranny; there are other unsavory illegal ( BTW not recommended ) ways to get green for title & build sheet.
Not sure how much you think you will spend trying to re-body & frame it, which will also involve illegally transferring meaningful IDs from current body/frame sections to new ones.
Even if u don’t consider your time as money during restoration ( 100s may be over 1000 hours) for decent or new parts only will exceed $50K-75K!
For that money, they r available documented in reasonably decent condition w/o labor other than some TLC! It sounds like your mind’s made up, though, so with all good intentions, I wish you BOL.