The stretch version just adds one rib per panel and the rib is shown on the plans so all of the kit cutters should include it or be able too. I built mine with the stretch version and use 1/4" of crow to keep it from floating. Mine flies great and I am building a second one, The smaller EDF one from MAN Plans and a enlarged turbine one. I just have not decieded on how much bigger 115% or 125%.