I'm still going to press you guys a little more. Hypothetical, I build a Joe Bridi Kaos but, I eliminate that little sub rudder under the fuselage, for various reasons (maybe just cause I don't like it LOL). That sub rudder is very strongly identified with the Kaos, and if I eliminate it and show up at a contest, whose rules will determine if I am Classic Legal or not,(as we say in stunt). That is ,whose rules will determine whether or not I better find a piece of cardboard and fast or, I am still good to go,(not that I am going to win, cause I probably will suck LOL).