FourStar 40 from a kit. OK, old thread, but I have to add my two cents worth.
Stock built wing and fuse, no problems whatsoever. If it can handle my violent and awkward attempts at aerobatics, it will handle anything. Snap rolls, pulling out of full-throttle dives, etc. Wing is stronger than it appears. Agree its easy to make it too heavy. I put an OS 60 4-stroker on it, had unlimited vertical but the approach looked like the space shuttle, steep and fast. Went to a Saito 50, shaved 4oz weight, same power. Flew like a dream, until last weekend. My pilot figure (Barbie doll head) took control of the plane and smashed it into some rocks.[] New kit on order, can hardly wait.