Does it launch inactive vessels, with its current fire things that get close enough behavior? That would make for some interesting practical jokes.. "Hey, lets go for a walk to the bay." "Ok." *near the mass driver* *push* "AAAAAAAAAAH" I may have to download the WIP version and try it later. Edit: Only the active one fires. Also, I have found a glitch that happens sometimes: You must jump before you fling a kerbal, or they go for a skywalk. And I suggest making the angle it fires at much shallower, or variable. I'm sure you have awesome things planned. It's very awesome, I like the way you've done it through Kerbtown.