I just built a SPAD3D with a Magnum .65 GP/SE and had to beef it up, it had to much flex in the fuse. I made a double U-channel fuse 4-1/2" wide and 40" long, stretched the wing to 40" and enlarged the tail feathers. Haven't had a chance to fly it yet cause I'm still waiting on wire for the wing, a definite must on this one! I'll let you all know how it does.
