Welcome,

I think you'll be pleased witht the e36- it's a stable and well known platform. IMO do not run a fuel cell. It's a waste of $$. BMW makes their tanks out of crash withstanding materials and they have foam in them already so in essence it is a fuel cell. Plus it's location is real safe- down low and in front of the axel (read; low polar moment). You won't need a diff cooler or fancy cover...BMW LSD's are bullet proof as it is....just change the fluid (don't overfill) and go.

Good luck and say goodbye to any pocket change you had...

R