Yeah I had a play around a month or two back, basically, you have to map all textures into steering_wheel_centre.tex and steering_wheel_ends.tex - that's all Flash did for you.
I was disappointed though as, although it is 3D, you still need to manually shade your textures, as there are no shadows in-game. So I decided not to pursue it, you might as well continue with the 2D shape.
I'd prefer an alternative to the external view, but that's another story!