To accommodate the electronics I created the space above the wing in the fuselage. The battery is behind the motor, as far forward as possible. Cut away a much as possible with a knife. In difficult spots, I used a hot nail to burn away the epp. The nail has been bent in a 90 degree angle.
The slot for the wire of the battery and the motor.
Overview after burning with the nail. The servo’s in the picture are there just to see if they fit.