Technic helicopter with motor, flex system controlling the angle of the blades and pneumatic retracting wheels.
About this creation
I built this mainly because I couldn't remember how the tilting of the helicopter blades worked exactly on my old 1994(?) Technic helicopter. I was just looking through the maunual trying to work it out and ended up building one. It is motorised, the blades tilt (just about) and the wheels retract using pneumatics.
This & your truck looks really good! Maybe you (as I did) could add an RCX and stuff - mine fired missiles at bright lights. I didn't have pneaumatics on mine but I think that since you've made space for the air tank and pumps you should put more cylinders in; opening canopy etc...
Do your blades tilt back & forwards only or side-to-side as well? A few more in-depth pics would also be nice :-)