Here is a basic overview of where what is..
The red line shows size and location of the battery box..
The green shows where the elevator servo is located..
And the blue shows the oringinal size of the rudder in relation
to what it is now..
The orange show approx how much was removed from the
vertical fin...
The large holes showing were made mostly for access to the
steering and rudder ny-rod installation with the added benefit
of less airframe weight..