So im getting a late start but I couldn't resist this challenge any longer. Got my concept and rough model done with some highpoly stuff on the way. The concept is basically a chopped up version of this aprilia bike that I mixed with other images and some paintovers.
http://imagens.kboing.com.br/papeldeparede/10604aprilia1.jpg
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the front looks like it could be a little more aerodynamic, for some reason right now it's reminding me of the front of a sneaker (trainer) shoe...
Here is a bit of an update. For the most part this is the finished engine, minus a few cables and wires. Should have an updated version of the full bike tomorrow.