Fantastic looking Corvettes. Very well done. I remember reading somewhere that the C6.R had air conditioning, so that rear radiator might be the air conditioner, maybe? Not sure.
I built the C7.R a little while ago, and I have the C5.R in the stash. I'd like to find a C6.R eventually. A C8.R GTE would be nice too, but I'm not holding my breath (too much to ask?). When I built my C7.R I downloaded the Revell of Germany directions as they had better detailing instructions that the Revell USA directions. Decals were different, too. Go figure.