Parts from AliExpress arrived:
- stepper motor controller,
- stepper motor linear actuator with 55 mm stroke (a bit to short for Honeycomb Alpha, which has about 85 mm stroke)
- stepper motor linear actuator with 80 mm stroke (with a weaker motor and a bit too much overall length for the Honeycomb Alpha - it may limit the travel of the yoke by a couple of mm).
Prototype 2.0 is presented on the movie - unfortunately I was missing my third hand to demonstrate the trimming principle while filming, I needed to use my leg to apply control pressures to the yoke 
Both actuators are mounted for test purposes, on the movie I’m testing the longer actuator.
The rubber bands for the pitch axis will be relatively easy to install (will be anchored under the yoke’s cover). Probably I will need to cut a hole in the cover to allow actuators fitting in.
So far the cost of the parts:
- stepper motor controller,
- linear actuator,
- two position switch (not yet shown on the movie) allowing switching the left elevator trim switch on the yoke handle from working with the Honeycomb electronics inside the yoke to control the stepper motor,
- 9V power supply,
- rubber bands,
- two end microswitches to limit the movement range of the actuator,
- some wires and connectors.
is at about 50 euro.
The only permanent modification to Honeycomb Alpha yoke will be:
- hole in the upper cover allowing mounting the actuator,
- two small holes at the back of the yoke for power plug and the speed potentiometer of the stepper motor controller,
- switch in the yoke handle (barely visible at the back of the handle)
- one small hole in the handle and another in the yoke’s front panel for a control wires.
Of course this will invalidate the warranty.