Ive been working with Turtle instead of mental ray lately and im really like its fast rendertimes and render quality compared to mental ray.
This scene is more about the lighting involved rather than the texturing (or lack of :p)
Anyways crits would be great.
Oh and the render took 25min on a 3500+ Amd with a gig of ram. On pretty much standard sampling settings.
Ive also just noticed the front windows lighting is blown out so disregard that

Cheers