Remaining bits of the back include the fuel tank cover (vertical plywood piece, attached to small blocks and top rail) and the floor in front of that (again, plywood). The rear cross-piece here needs some additional machining (holes, relieve the angled edge some more), and there are a couple of small blocks behind the door post to hold the seat back and attach the sill trim to which need to be made.
Test fit — Not looking too bad at this point. I discovered the cause of the “gap error” at the top rail in the back…I had the rail too far back. Now fixed.