Hopefully I can still be able to get some stuff from Hist. Racing Miniatures including the Cobra Dragonsnake conversion kit to do the black version of El Cid.
There is a YouTube video of CSX2001 in the 60s that was taken in color, and it shows the car painted red. If I could find out what color it was when it ran the Tour de France in '64, I'd do it.
A story on CSX2001 with plenty of photos of the car with the roof it wore during the Tour de France race in 1964. http://saac.memberlodge.com/resources/0109/0109-csx2001.pdf