I got chatting to a guy who had something similar years ago. Apparently him and his mates all made them after they lost their driving licenses for driving pissed.
Based on their inherent rage and proclivity for riding on sidewalks, that’s the same story I attach to the dickwads that have those conversions around here.
I’ll just leave this here
https://www.gumtree.com/p/bicycles/bike-motor-/1411415332