Pit-Viper 1,
With the receiver mounted just behind the nose gear former you'll need 24" extensions for the aileron servos and 36" extensions for any servos in the tail booms. A "Y" connector will not work for duel elevator servos unless it is a reversing Y. If you are using at least a six channel receiver you won't need a Y for the ailerons. If you have 8 channels and fixed gear, you won't need any Y's at all. 6" and 12" extensions don't get ya very far in this plane.