I was just wondering if you were planning on doing anything interesting with the motor controller for shifting. I don't know if you did anything with the E36. But, since you have an rpm sensor on the motor you could also install one on the transmission input shaft. When shifting it would be fairly easy to rev match the motor to the trans for very smooth shifting. A friend of mine sort of did something similar with his EV. The difference was he just had a button to make the motor spin ~2k rpm which made it easier to shift (it was an AC motor setup).
In any case, the adapter plate looks pretty good. Can't wait to see that engine ripped out!
I also added some additional description to your thread title.