I have just bought a 93 Subi for the engine,loom and ECU.I remember reading on here years ago that somebody had a business modifying the loom and ECU to fit straight into a Beetle and run.
Try Toddy at AGT Engineering
http://agtengineering.com.au/electronics.html
He's a buggy guy, and also builds the CANBUS emulators for Subarugears
Thanks.
Andrew can interface anything to anything...with wires!