Brian, thanks for the textures. Both of the them are great! I like them. The textures give the model more weight, more power and also more realistic. How I envy you!
I choice blue partly because I like it, but mainly because I did worse in other color.
And I think if u can add some dirt to the belts and the wheels, it may be more fit to the whole.
BTW, if u can change it to the green color, I can add some cover, such as branchs and leafs... cover the model and let it go to the forest to perform some secret missions... just thinking...Haha. Thanks.