Hi Mike welcome to the 23 club, i also have one i scratch built from a few pics, and have a Honda K20 type R mated to an inverted Subaru 5 speed box in the back. boy i'm envious of your cad skills, and i wish i could have got hold of a few measurements, i got most of mine by scaling off pics using the wheels as a datum, here is a link to mine,
cheers John