Well, I have rivets in the Osprey "Aircraft of the Aces" Spit I/II book, which are good enough for the game. I could get away with using the same rivet patterns for Spit V, Spit IX, etc., because rivets are barely visible on a properly done skin, even up close, and most of them were probably the same anyway. My conscience would be fairly clear.
I guess I was looking for a sanity check for Spit I/II rivets on later models are said to be under development by HTC.
On the Russian site, I guess I would trust the Osprey books a bit more, if there was conflicting info. I remember their claim of "all new drawings" and "extensive research", last time I visited my bridge in Brooklyn (only $500.).