Yes!
After thinking I would not find one, picked up a E30 M42 engine + gearbox, diff, computer, engine harnas, air flow meter, drive shaft and radiator in Germany last Friday!
So happy! popped up on German Ebay, didnt expect to find one.
Since the one I found last month was gone really fast.
So I wont be able to tell you if the E36 M42 route will work. Good luck with your build!
Paul