I am building a Slow Poke and the plans show to bevel the aileron with the hinge in the center . You need to add some extra backing for the hinge . An alternative way would be to hinge at the top and bevel as Tom suggested .. I prefer this way myself and am going to do that with mine . I think it might help in the turns .. I am going to use hinge points also . I find them easier to install than CA hinges .