Really fun concept. I love having the manual to reference. I do wish there was some more feedback when you get a part wrong. Something that says "too small" or "too large". Or even where a part that's somewhat close but not exactly correct will pass, but effect your final score. Having everything be all or nothing with no feedback makes it pretty challenging. I like the concept a lot though. It would be cool to see the idea extended with some wacky scales or parts to make it even more challenging!