I built two of these and never had to flip it over. I built the struts on the plans, then attached them to the wings, and both planes have the correct dihedral. What I did have a problem with was excess covering at the trailing edge that cocked the wing ever so slightly against the fuse, and the very first landing it went CRACK, and busted the outer fuse rib that the wing bolts to. I have since doubled and tripled the strength of the upper fuse and only in a crash will it break again. The first one I built is a blast to fly with a Saito 100 in the nose, the second one I bashed into a bi plane, and had a not so successful first flight, and its in need of repairs, but the upper wing has the correct dihedral even though the struts come halfway up the side of the fuse. I don't remember exactly how I measured to get them the correct size, but they fit nice and tight.