Cool man, are many parts interchangable with the rx7s etc? Would make things a bit easier.
I've got a few friends with some nice rotaries/old mazdas.
One mate's got a series 7 rx7, an RX3 drag car (HVATOS, if that means anything to you), and an RX2 with a 20b turbo.
His neighbours have got an 808 sedan with a 13b, and an RX3 coupe with a brand new renesis engine that he bought from Japan. (Bastard!)
One of their other mates has got an RX2 sedan that was alledgedly built by pac performance, with a rather insane 12a in it.
Another mate has an insanely well restored 808 > RX3 conversion thing. Looks and sounds awesome.
Keep us updated with how the hatch goes, it looks like a cool project.