I remember building these N scale signal lights.
I built 2 of them, working LED's and all. They started out like this...
At one point after fiddling with the ladder for over an hour on one I crumpled it up into a ball and threw it into the trash can under my bench. After cooling off I...
Yeah, it is pretty crazy the amount of focus some people possess. I used to scratch build N scale model railroad vehicles, which are even smaller. But my eyes [post-cataract surgery] won't allow that without heavy magnification any more.
The only thing I noticed in the running vid, it doesn't show a single clip of it actually exiting a corner and straightening out. But who cares lol. It's one of the coolest rc builds I have seen.