Love your future project!!!
First here's a picture I took from this last years SEMA of a Tesla floor pan with the rear motor.
You should be able to zoom in on the photo bucket page and get a closer look?
I've been thinking about adding a electric motor also to my AWD Talon in a couple years. I haven't decided which way to configure it though???
My car is a AWD Auto right now that makes over 600+ WHP, so I would want to match the performance of what I have now but run the rear axles with an electric Tesla motor? My thought were to run a FWD transmission. I just haven't figure out if I should run a auto or manual yet??? So I'm defiantly up for suggestion's?
Anyway glad to see your post and will be watching closely.