BRILLIANT I knew it could be done !!!!!

I saw an earlier post of yours and I guessed you were going in this direction. I know we're told time and again that we should be comping in models rendered in external packages but I don't think this image could have been achieved without rendering in Terragen, The reflection map alone would have to be massive! I would look more at the reflection myself, its a little too much in places and I agree with the others about the tyres.
Really looking forward to the finished image, one for the IOTW I strongly suspect

Richard