Happy that this topic get some interest
Fortunately my mower has an Hydrostatic trasmission , so the only actuators I'll need apart the steering will be
- brake actuator , actually a pedal that disengage a pulley on the transmission belt
- Automatic transmission, a lever that has an operation similar to the automatic gearbox of a car with the nice feature of reverse position that can be used to stop or reduce the speed of the mower , something that a car cannot do.
I have bought a used electric steering unit for 100$, will receive it in a couple of weeks and start to work on it.
In the meantime, I'll post some photos of my mower.