For several weeks, I would go check on progress and I would end up ordering more AMD sheetmetal. That's just the way these projects seem to go. Originally the rear crossmember, which is behind the rear bumper, was just going to get some patches. But once the bumper was off, and the rust was exposed, I ended up buying the rear crossmember, the sheetmetal right above it, and the rear corner pieces that run between the crossmember and the quarter panel.
New rear crossmember.
When I first got the car, I looked at the rear window channel and thought it looked pretty solid:
It turns out i was wrong...