I was just aiming for a simple bike. So, if I made the body controllable, it might lose it's simplicity to control. The body moves though, maybe I should have lowered the hinges' break limit. Anyway, I don't know much about dirt bikes, I might reconfigure it soon so it'll have front brakes.
I'm making a left and right moving system now. I was gonna use another thruster but it was too big and cumbersome. I made it smaller and the balls just kept going through the wall.
Of course I copied it. Where else did you think I got it from? That's also the reason why it's named "Destroy The Castle!", it's kind of a parody of "Crush The Castle", this is the Phun version of it.