I myself just purchased and am waiting for the Modelhaus Impala. Therefore I would definitely be interested in your Caprice, but would probably only purchase one due to the high price. Depending on the detail, I might even go for a second.
From what I can see of the grill, that appears to be a 1980-1985 Caprice Classic. Is that what you're going for or will you be making the 1987-1990 Caprice? I can see the latter one definitely having much more appeal, as that was the police model.