I think you will throw off your balance if you put the rudder servo in the tail.
I had a Diabolic with a Saito 100 and put the battery forward for a perfect balance.
I think you would end up adding weight to the nose if you put the servo in the tail and the whole point to this plane is to keep it light!
I don't understand why you would want to put it in the tail anyway, just put it where it is supposed to go with the pull-pull.

Jim