Dunno, like the model but I feel the texturing is letting it down a tad, looks too "generic" the rusty metal appears to be far from rusty and looks similar to everything else.

Maybe study the materials a bit more and then use some custom alphas on the textures to sepperate them more.

I would go back and slow down a tad and refine,

Good going though mate! liking the low poly work so far!