Known issues:
Using Flipping Heck while the vehicle is at a significant angle may break the barrel, making it displaced and floppy, probably has to do with the SliderJoint distance being saved improperly.

Hinge joints can rotate a tad bit too much. For example, despite the turret hatche's counter-clockwise rotation limit being set to exactly 0, it still manages to bend more than that in some instances.

Colliders aren't perfect per-se, since I'm using a very inefficient method here.

Wishful features:
Cannon effects. I didn't want to make the cannon just create a grenade explosion particle effect, that just looks bland. Attempts at making it create an effect similar to the vanilla tank cannon failed.

Physical interiors. My custom collider-making method fails to make rooms inside of colliders for some reason. Not that you'd be able to fit a human there without him being crushed by the wheels moving up and down anyway.

Feel free to leave bug reports here. Just try to be able to read and don't post an already listed/reported bug.