Kuky is right, the grey one is 8292 triangles (multiplied by 16 by the subdivision surface modifier for a total of ~130000) while the white one is 98 triangles and all the detail is in the texture.
@ Rman: Steampunk? Hmm.. I've always liked steampunk and I have made some models of that style before. Maybe I'm still a bit affected by that style, although I'm going for a more hi-tech look with these models... Still, glad that you like it
@ Corporal Punishment: Thanks, I wanted it to look like it was acually meant to be able to rotate, not like some kind of static module on top of the tank body.




