I am not sure about it since this is the first Cap that I am building, maybe Tom could help us on this, I understand that this is the second Cap that he is building.

Since the beginning I thought that my Cap could be nose heavy because of the engine that I am using but I have some facts that I want to share with you:

In my set up I used 2 Hitec servos HS225BB weighting .95oz each = 1.9 oz total at the tail for the elevator purpose, instead of the regular servo for rudder that weights around 1.5 oz
I am using a Saito engine .91 size that weights 19.6 oz plus muffler, instead the surpass 70 recommended which weights: 20.5 oz plus muffler.
According to the plans, In the surpass installation the battery goes a little back of the wings, in my set up the battery should be installed near the CG.
My rudder and throttle servos are regular size and the ailerons are miniservos.

Some numbers to think about:
Counting the total servos weight and engine weight that I am using, in theory I have 26.4 oz plus muffler
The stock GP set up using the Surpass 70 size and four regular servos is: 26.5 oz plus muffler

With my set up I am saving the weight of a fraction of the elevator push rods and aileron torque rods, so finally I can have better performance using more servos (6) and a higher engine with less weight than the stock set up. (4 strokes related)

The Os 46 fx should be around 17 oz and that is why GP consider on the plans that the battery location should be in the front of the tank tray, but when you add the aileron servos I think that the battery should also moved a little backwards.

I'd like to know your thoughts.

Thanks.
Alfred.