[Racer26]

Also, I think it goes without saying that any edges should be very rounded and preferably most of the hard parts of the catapult mechanism somehow padded such that in the event of it contacting a team member while in motion it doesn't cause too much damage.

In addition, efforts should be made that the systems be as harmless as possible when the robot is not energized. Perhaps having your spring pack connected to the rest of the system with a carabiner. Non-spring based systems should by default generally be fairly harmless when not powered. Just remember to watch when evacuating the air system of the direction things could move. I have been hit by moving parts before.