Back from my holidays and back to the drawing board and time for some reflection.

Lessons:
The scooter motors are too heavy for anything but a push in this class (as I was advised)
Got the electronics working woohoo!
Realised chain drives are a lot tougher to get right than I expected
All the nuts, bolts and washers add up to weigh a lot more than I expected

Due to the number of failings I am going to park this concept and try something new