Do special brick need a joint like a radio?Do they?
If you're targeting props for your real life stuff, I have no loving clue.
I also want to discourage you to use/make a prop system.
Make stuff items, (Learn BLB format), or use JVS Content system.
For JVS you don't need any special joints, Just the ones you need for animation.
Also, Come on xfire. I've almost finished script.
