Good looking plane. Well done.
Only suggestion, and this is something that I myself "might" do, would be to turn the cylinders horizontal on the engines. Leave the tanks as they are, but rotate the crankcase & cylinders to horizontal to provide a "cleaner" looking profile. Off hand, I can't remember if that would have any affect on the engine runs, but I think it would look neat, especially while flying.
Just my 2¢.