I've never built the Osprey Bipe, but it looks like a really cool plane. If you have an OS 91 Surpass or Saito FA91 lying around and you're looking for a plane to put it on, maybe this would be a good subject. It's essentially a biplane version of the Osprey II pattern plane.

The short kit includes fuselage sides and doublers for either the long-nose or short-nose option shown on the plan.