Thanks, Skip, Paul!
Skip.... it's going to be Ferrari Rosso Rubino, which has a very light, fine gold flake. It's not quite a Maserati colour, but close enough to their version for, and available on my shelf in a Hiroboy paint! Tan interior, I think. For your one, how about getting a pearl white, and adding drops of black (and maybe a drop or two of dark blue) until you get the grey you want? It worked very well for the "Silver Birch" on my James Bond DB6...
Paul... thanks.... I think. I think I'm committed now, since I'm not reworking the windscreen master! However, it'd be interesting to know what I'm missing!