1000 plygns to much? havent have performance so far
rounded glass = more polygons
besides at the hight its flying in the game you cant tell if there round besides
are the wheels in general round ...nope.
How did you do the rotor blades? Someone told me to use 3/4 triangles and then make them rotate, the poly is far less and achieves the same type of effect.
Like the texturing btw, i think you should make the gattling cannon at the front larger, it looks too small imo.