Amazing imagination you have. I cant think of where do you get the ideas of how should particular piece look like. As stated before - geometry is simple (no smooth, rounds... etc.). But i do love it!
Poly-count?!
Kill me...
What's your gear? I mean, ram, cpu, gpu?
For this model you definitely deserve smth. new, like quad-core intel and 8800GT at least ;-)
P.S. Looking at your renders i tell myself - "man, that's the way you should do it"