Well I found a 20b for a great price. Has lots of goodies and I think I got a good deal.
Gtx42r
60mm tial gate
3 rotor manifold & downpipe
6 ID2000 injectors
Fuel rails + clips and wires
3 rotor motor
Twin disc clutch and flywheel
Ianetti ceramic seals
Etc, etc.

Gonna mount it next year sometime. Looking for a mount kit to put the motor further back soy t56 shifter will line up with the stock hole.
The motor was built by kyle Mohan from mazdatrix. It's a 937 pre code motor. 12.7mm studs, balanced, rotors clearanced, and ceramic seals.
Hopefully it will do me just fine.

 

Fyi, know one makes an off the shelf mounting kit that moves the engine back. My engine is moved back 5-1/2" and I had to build my own subframe. Im currently fitting a t56 also but I have the CTS-V version that has the shifter linkage. This is perfect because I can mount my shifter exactly where I want it.

 

Yeah I was following your build. Gonna do the same. Try to position the motor far back to where the t56 shifter location is dead center or close to the stock shifter hole of the rx7.