I agree... I would go for the white on my "retro" logo as well. In addition looking at photos of the camera I hadn't seen before I'd position it on the other side of the camera where there is a nice big square piece of real estate. That way all the present Contax markings can stay :
maybe tone it down by making it silver grey (there is a lot of text on the camera):
I only knew it was one of mine as I did a negative image on a silver one, masking out some bits that didn't look right in the negative, but not others ..... oops there goes my secret of where I got the image of the black back from.
Out of interest where did you get the "real" black back image from?