Just a quick note on the Y harness.

You don't need to cross the wires in the Y harness. Just make a normal Spektrum x-bus Y harness. The wires get crossed into the right orientation when you use the KT supplied x-bus cable.

On the other hand.. if you crossed the wires in the Y harness already this allows you to use a normal Spectrum extention.

Do not use your modified Y harness with the crossed wires AND the KT supplied x-bus! !