Custom project help!

Hello new to this. Looking to do something that has not been done a whole lot. Looking to put a LO206 with FWR gearbox into a mobility scooter. Off-road use only of course.
I am wondering required dimensions needed in the rear end for such a thing. Motor, gear box, torque converter as well as axle.
Scooter I have is a Pride Pursuit ES SC713es
Trying to make it look as stock and unmodified as possible.