Sunday Fighters by Ken Willard

The Sunday Fighters were a nifty project to turn a set of Ace foam wings into a biplane that looked sort of like a generic WWI fighter plane.  The plan shows two tail outlines, one resembling a German plane, the other resembling an Allied plane.  The kit comes with the fuselage and tail parts, as well as enough Ace foam wing balsa substitute kits to complete the model.

Either plane is $30, or both for $50.