Been working on this on and off since December last year. All modeling in Blender, rendering in Blender Internal and more recently Indigo (of course!).
WIP thread for the progress so far is located at Blenderartists.org.

The black headlights is a resolved issue, and a new render is in the works. After just over an hour it's at 130 samples/pixel, so I think it's going to be left overnight and possibly for half of tomorrow.
Comments and Criticism appreciated.