Upholstery. Made the passenger door top today and went ahead and installed it with the front "roll" piece. Nothing—but nothing—is easy on this thing.
There's a 3/8-inch gap between the trim piece and the door proper at the top. The bottom (which no one can see) is nice and tight.
I ended up clamping the piece to close the gap, but I think I'm going to have to take it apart and reshape it.
Again, the look we're going for:
My clutch part came yesterday so I'll probably turn my attention back to the drive train for a few days whilst pondering what to do with the interior...