My memory is that the computer model of the boxfish was a Cd of 0.06:
The
blue quarter scale model has a Cd of 0.095 and the diesel powered concept car has a Cd of 0.19:
Edit: here's a series of screen captures I got from a video about the Boxfish, that show many more angles of the early model:
CarBEN EV Concept :: Mercedes Bionic/Boxfish clay model picture by NeilBlanchard - Photobucket