RE: Just dreaming up another.
I would think that you could go locate some old Air Trails magazine of the 1930's and develop a concept from one of the cover paintings. Inverted gull wing and open cockpit would be more of that era too. Then, if you want to go after the bad guys who were bringing in Canadian booze and find their hideout, you also have to modify the design with M.G. through the propeller hubs.
Wm.