Yep, just build to the plans, Joe did all the thinking and testing for us years ago. On my forth repair and recover I did add a bunch more fin to help with a smoother knife edge. It worked very well but then it weather vained about three times more in a cross wind. I liked it but any mods you make effect the plane in some way. I do a lot of stunts from the knife edge and discovered his Dirty Birdy was a better plane for how I fly. Blue Jay still cuts and sells most of his designs and the prices are right.