I've been wanting to do a x frame convertible conversion or a tri five 2dr conversion for a while partially for the challenge. It would take at least a clean 4dr to save that Buick. It came from Minnesota to MT in the 70's and spent 50 years in a damp barn. The rust is weird. Everything low is really really rotten but the upper fasteners look new when I pull them out. The convertible stuff all seems pretty good. It's also funny to see how much better Buick build quality is than Chevy. Just looking at the inner fenders, Chevy is obviously the cheaper car.