Under the hatch cover.
The top pivot is a bolt with two nuts on it. Version I, the red hull, had the steering servo mounted in a hole cut out of the styrene directly under the axis of rotation of the pylon. It formed the bottom support for it.
Operationally this was great and easier than organising a linkage from the steering servo. Unfortunately within a short time, the servo suffered water damage. (I probably could have done more to protect it) Version II, the green hull detailed here is more
conventional. A short rod sticking out of the hull is the bottom support.
For the motive power, I used the motor/ESC/batteries from a Cessna model. This has now been retrofitted
with a brushless motor. (Actually identical to that in my jet boat)
Overall weight is a consideration
when choosing a motor and batteries, the lighter the better. My model weighs 450gms (1 lb.)