The only problem I had was with the ailerons, as they're pretty thin, and tend to flex. I used the CA hinges, and found out that, due to their stiffness, the tips of the ailerons had about half the throw of the inboard ends(hope that makes sense). As a result, I couldn't get a decent roll. I cut the hinges, except for the inboard-most on each side and installed clear monokote hinges. Now I have a completely different airplane, very responsive, with crisp rolls. Glen