I think that is the best idea I have ever heard of...lol
Go to a scrap metal place or look at the dump for an old ride-on lawn mower for axles, even better if it has the wheels on it.
I wanna see some video footage when your done. love your work...
Sounds like good way of getting a trolley with your engine wheels and axles on/in it confiscated by the police. would be okay if you had somewhere to ride it though. but really you know where a bike motor does its best work - in a bike!