Franck Virmaux V4 500
I'm basically using this page to point you toward Franck's stuff online. Yet another ridiculously capable 2T fan who simply makes crankcases/ engines and carburetors from scratch, as one does. Also frames, apparently entire GP bikes and god knows what else. Just go to his FB page, and start looking, and prepare to be amazed.
V4 engine cases ready for machining
Frame going from design to reality
3D sand-printed moulds to allow precision castings
French 2-stroke forum with many photos of this project
Something like my little scooter is revealed to be a backyard hack job, in contrast to the technological tour de force on display from these engineers and fabricators. Truly staggering!!