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!
CC0 is very generous of you, thanks!