The Peter Barth 1/3 scale Waco YMF is a great choice, before i built my Balsa USA Stearman, i was debating between the Waco and the stearman. But you are looking for ideas, why not a 50% bucker jungmeister? Sounds big but its not, Wing span is 12'' bigger than the Waco, I'm building one right now just about ready for painting, one of the best kits i ever built, just a idea,
Edi