Great historical video on the making of the lowly Trabant. Also some info in the beginning on Auto Union. Obviously, worker industrial safety standard never existed in East Germany and it really shows.
So, this is more car/car-adjacent, but I'm a sucker for model-making videos on YouTube. I've found a few that focus on modifying Hot Wheels and other diecast model cars. Modifications can go from bodykits, paint jobs and wheels, to opening doors and hoods, suspension and steering to full RC controls.
And on a related note, the most gripping race series on YouTube, 3Dbotmaker:
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