If special color is player color, then definitely use it so that the green/red/blue parts are player color. There were a few engine classes which from outside differed only in color and from inside differed in engine AC/DC. The one you painted last is one of those.
Btw I plan a summer trip through southern germany, so if you want we can meet somewhere and I'll bring some beer. Perhaps not full crate... P.M. me if interested.