The IP rule is mildly frustrating, but as far as I have experienced the other rules are pretty standard for private trackers. The no mobile seeding thing is something I’ve never considered, though, so that may or may not be an issue elsewhere.

Could be an abbreviation for “constable”?

What I understand of it is that it is more for printing replacement parts (non-electronic) and general understanding of the controller

Edit: Having finally downloaded the files, it is just the exterior. Probably couldn’t print any replacement parts, although the .stp files would get you close. Definitely just for designing accessories (and printing adorable tiny Steam controllers)