I built one some time ago....I am using an YS-91 AC with a Zinger 14 x 6-10 prop, JR System
JR 531 Servo's.... Rudder push pull, Elevator with the supplied pushrods..Y type..seem to work just fine, Ailerons (2) JR 531's....Using a Slimeline Pitts type muffler. The wing struts are held together with 4-40 cap bolts and blind nuts. The model balanced right on the mark, the plane flies very well nothing unpredictable.[8D]