I have built and flown the plane and also deal the product line.

My plane is currently set up as follows:

Saito 72 out almost to the end of a Dave Brown mount.
Futaba 3004 servos 2 in the tail, 1 in each wing and 1 in the throttle servo position.
The supplied fuel tank is in its stock position
1200mah 4.8v Ni-Cad is under the fuel tank.....
GWS RD-8 Receiver mounted in front of the throttle servo, right behind the tank......

It balances perfectly as I have it setup......hope this helps!!!

Let me know if you have any other questions.

Bill