So guys I made a mech thing:
I call it the Jackal.
It still needs some work (arms, and especially the legs), but over all I like how it's turning out.
Also I made a quick demo thing in the Blender Game Engine:
Currently the game/demo assumes the player is using a dual stick gamepad.
The torso can rotate separately from the legs, and the Rocket booster does indeed work, though it lacks effect atm.
Also I still need to animate it. :X