Is solar tracking worth it?
Linear actuator should not take loads continuausly. This design uses solonoid to lock panels in place. The only time the actuator supports loads is during movement.
Servo motion control by Arduino and LDR. When watching the first video, I skip the assembly bits and go to the circuit design and code around 08:20. I'm using this to control 30 full sized exterior panels, so the laser cut wood does not apply.