The shaft from the transmission has a smaller diameter extension that extends out of the bell housing. Two problems with this... One, it complicates the design on the coupler. Two, it forces us to mount the motor further back and requires a more complex adapter plate.
So what's the best solution? Just cut it off. I had some fun with a borrowed grinder and one sweet cutting wheel.
You can see the piece I removed in the picture below. For anyone else that's planning on trimming the transmission shaft, this was the first time I've ever used a grinder, and it went very fast and very easy. Definitely something you can do at home (with goggles, gloves, and a long sleeve shirt). Sparks were flying!
I didn't have too much other progress on the car this past weekend, but each little bit helps and I'm still one step closer. I'm aiming to buy the Aluminum plate for the adapter in the next couple days, and then I'll have lots of fun.