I purchased the larger of his two short kit choices for the B2, like Walt said, bigger flies better. I chose the Valach 60 mostly because I dont like the weedeater 2cycle sound and they had an engine big enough for my 42% B2. Mine came out to a 99 inch span and a fuse 99 inches long. Really pleased with Walts design, its built strong and lite. I did change the wing to a three piece to aid in hauling it around. I used an Aluminum tube and I had somewhat of a hard time finding a tube small enough to fit in that thin airfoil. Hopefully it will be strong enough to handle the wing loads during lite Aerobatics. I put it thru three wing bays for strength. It does have flying wires and that should handle anything I might ask it to do. I used Balsa USAs flying wires and there system looks clean and strong. Right now Im working on the Bar between the landing gear legs, thinking about using an Airfoil shaped tube with an allthread shaft inside for something to attach the lower flying wires too. Sometime soon I hope to be able to upload some pics of my project and let everyone in on the build, its been a great build so far. JIM