Sweet tools. I have a similar stand (maybe the same). Having a 4 wheel instead of a 3 wheel makes a huge difference and is much nicer You will enjoy that extra wheel.
Building your trans bracket yet? A friend mentioned that the trans should ideally be about 3 inches from the support post of the stand in order for the trans to rotate fully.
I found the proper spacing by leaving the movable piece (usually bolted to motor) on the rotisserie of the stand and bolting that to the hole that is on all 4T65'*
Then I made the other part of the bracket go directly to the rotisserie for strength.
Overall it works great
In making the bracket, I found bolting the one hole to the trans and then making the rest of the bracket etc, and welding while on the trans worked really well. Since the rotisserie part comes out of the stand, this was rather easy. I tried to center the majority of the weight in the center of the rotisserie to make rolling it over as easy as possible. Versus a motor with heads on it that stickup and make it top heavy.