Here's a little overview of the controls that I found:
W-Chaingun Up
S-Chaingun Down
~8-Winch Up
~9-Winch Down
i-Missle Launcher up
k-Missle Launcher down
~Left and Right Arrow Keys-Tank wheels
Num4-Infantry Hatch Close
Num6-Infantry Hatch Open
~1,2,3,4-Leave In For Missiles To Launch
~3rd Wheel Is The Bugged One.
(Paused Scene And Deleted Wheel and What I Think Was A Suspension System)
~Chaingun Doesn't Fire
Your Barrel Needs Work. First 3 bullets went through fine but then either firing pin spinned to the other side of that block, or the bolt would wedge itself somehow into the magazine or go backwards after firing the bullet cockeyed & jamming thatway. But VERY nice, Love the part where you have to disassemble it. gets a 9/10!!