If I had one of those go karts, I'd be grinning like a 'Cheshire Cat' too.
Years ago I watched a video of some guy's make a set of wagon wheels for a
Borax wagon, IIRC they took about a week or so, and wondered at the time how
they made them for a production line, I couldn't find a video of the spokes
being made.
I think it's a copy lathe process like for gun stocks, I did find this video
of a man on the production line assembling the spokes into the hubs and rim
At 2:16. I don't think I could not have kept up that frenetic pace for too long.
https://www.youtube.com/watch?v=v7jK_pIfTf0Dave