On another note... I am not sure if you have an engine yet, but both of the ones that I have built have been way tail heavy. One was with a Saito 150 and mine with a Supertigre 2300 with a pitts muffler. You might take that into consideration that if you have to add weight, it might as well be usable engine weight instead of dead weight. By the way, have you started on yours yet?