When I was prepping the trunk for paint, I actually crawled in there to better reach some areas, and I saw what looked like fiberglass resin at the base of the rear window. Investigating a little further I started tearing into some spots on the “primered” roof that looked suspect. Turns out the vinyl top had gone bad and been left like that for who knows how long. All around the rear window was rust. Not good.
This began the long process of finding sheet metal from doner cars. I tried for a while to come up with an entire roof skin, but I couldn't find anything that was even close to local. I wound up doing it in 4 sections, the piece above the window, the 2 lower C-pillar pieces, and part of the Dutchman panel.