The model has been done using several reference images [not included into zip file]. Render time on quadcore i5 / 5h. rendered with cycles 500 samples. The model is quite midpoly 180k polys in the view port. With subserface on, 800k. Rendered file included. Production time about 3 days. It is all yours. Let me know if you will do something cool with it.
The Camouflage Shader's node set up done by elbrujodelatribu. (http://www.blendswap.com/blends/materials/camouflage-shader-2/)
Basic suspension model (not rig) done by kuhn0362 (http://www.blendswap.com/blends/vehicles/basic-suspension-rig/), edited by me to create suitable track suspension.
It is easy to clean up so you can create low poly model from it. Enjoy!