Biplanes.... Well.....frankly, a cursory search of barnstormers leaves me with the feeling that unless you just have a burning desire to build one, there is no real reason. You can buy one already assembled and flying for less than the cost of the engine. Fewer and fewer people are interested. I don't expect mine will retain it's value, or that I will sell it for more than I bought it, even though I have put quite a bit into it. I don't really see the need for a new design, unless that is just your particular thing. They are fun-I have one. But a biplane is not a refined, perfected aircraft. They are great for learning to land a blind tail wheel, uncoordinated use of the the rudder, and coordinated-uncoordinated use of the rudder, plus aerobatics. The aerobatics part, mostly because it would be difficult to exceed 160 mph in a vertical dive with full power, and they are structurally robust (mine anyway). They are not a good cross country machine, and the mono-plane long surpassed them in all aspects. The power off descent is eye watering....Still, there is something there.... People look at you differently when you land and taxi up in a single seat open cockpit biplane. Sometimes a bit sideways.... They have quirks, smells, and habits that you only get from flying one. I was asked, how do you get checked out in that?.....Strap one on, that's how! You won't regret it. I'm glad people have time to build them.