Another idea that I have been pondering is using the complete SR20VE and just turning it sideways.
Apparently the RWD SR upper and lower oil pan fits, which in turn also makes all the bottom bell housing bolts line up.
Project Datto - racetech's 1200 SR20VE Project - CARforums.co.za
This was what I originally intended to do, and I have the clutch, starter, bell housing, and motor mount brackets figured out as well. However, I have been told that FWD motors have oil drains in the middle of the block which apparently would be bad, so it put a damper on my plans, although I have not been able to find pictures of how different it is on the FWD vs. RWD SR block.