I built a flew one of these a long time ago. I liked the kit a lot. The only thing I did different was to beef up the wing strut mounting points. Use extra plywood pads where the screws go. The idea is to spread the load for rough landings and the like. Oh yea, I used 1/2-20 nylon bolts for the bottom wing and landing gear. Glass the lower wing to 1 inch beyond the fuse side.

I only used a OS 91-4C and it was great for standard aerobatics. It would knife edge easily but not do a knife edge loop. No 3D, of course. I have heard of people use huge engines on this plane. If you use a light weight engine, it will literally float down to perfect three point landings. You'll look like a pro. You can also fly low, slow, and close-in. I bet any 120-4C would be even better than the 91 without much more speed on landing. The YS 90 would also be good. No use using a 2 stroke. It just aint right for a bipe.

You will absolutely love this plane. Once you get it properly trimmed for aerobatics, it will be a pure pleasure to do all the aerobatic maneuvers. I learned a many new tricks with it.