Color coding: parts with the same color move together as one object.
Central to the model is the red axle of length 12 (drawn slightly longer for clarity), which has three purposes: it holds the model together; it permits the steering mechanism to tilt, giving a nice all-terrain functionality (very much needed among the desert ruins); and it allows attachment of the crank that was used to start the engine. I have broadened the wheel base to 7 units, and had to adapt the rear wheels as well, by an unusual trick using LEGO TECHNIC(r) pieces.
Be sure to check out Eric Brok's version (on his page select `miscelegos: wwII half-track'). His steering mechanism is more compact, 4 bricks wide.
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