But I did manage to make some progress in dieting the wiring harness. It's a very small example, but this is the dash clock out of the donor car. I won't be needing that, so I traced and cut out the wiring for that. I'm still working on identifying what everything is.
What I was able to do, though, is cut down the mounting tabs on the bottom, and get some steel welded to the bottom for mounting in the car. This helps move it down and back a bit, so it will be less in the way while driving.
Both the parking brake and the shift lever have solutions in the kit, but I have opted not to use them, because I like my way better.