I experimented with a few quadcopter designs. The quadcopter with elavation adjust is very stable. I tried to steer the copter with the rotational motion of the wheel but it didnt work out too well. Maybe someone can improve it. 



Controls : 
Spin the blades : arrow up(hold)
Adjust height (pitch of the blades) : left and right arrow keys
Move wheels in the middle :8,2,4,6
Also use invincible mode, you can sturdy up things by adding more blocks but i like to keep it clean...
P.S.: This is my first post so bear with me...