Hey, I'm interested in completing this bid for you. If your 2D concept is a bit more fancy it can take me more time but when I say a day of work I mean 24 hours and I don't stop until I've completed what I've set out to do. The conversion from your 2D concept should go pretty easily, I'm used to this kind of deal from my experience with modding communities.
I can get this done in 3 days, 1 for modeling, 1 for UV, and a day for painting.