I was just playing with photoshop and threw down a quick overlay allowing me to use any color imaginable including that horrid rust color you see down there.
I have just been thinking about doing a matte white with matte black (not flat black primer grey color)

^ More Like so
Also tossed on a light teal blue color that I thought would be interesting to see.
If anyone wants to see a color just grab me the web color number
(For example #132fd8 is a blue color)

I've just been debating how to go about adding in the black. I Don't care much for the two tone black roof bit, but I will be playing with it for a bit. Any suggestions or like I said any color you'd like to see.

 

oh and about the back window, been playing with the idea of welding that up. Before anyone says vision obstruction...who uses that window? Seat/passenger is in the way of the right side and the one behind you good luck I sit further forward than that.

 

the whole back door looks odd if its the same color as the body imo maybe you should do it like the r8?