Why Garrys mod rocks so much:
Manhack hovercraft:
powered by technology not yet known to man the manhack hovercraft is a marvel of stability and control, just stand in the direction you want to go and it will go that way.(ballons required for flying ability.)(thrusters optional)
to start:
place four squares in a cross patern
Then add manhacks, ballons, thrusters, and weapons if you wish