Actuator for small window

A simple actuator from a small, but full metal geared motor:
12V motor http://s.click.aliexpress.com/e/bTtwpF3a
or 24V motor: http://s.click.aliexpress.com/e/EBW8dAY.

I use 4 RPM version, but 1 RPM to 4 RPM is OK. Smaller RPM is stronger.

I designed this thing to remotely open and close a small window (30x45cm) in the attic using mysensors relays (https://www.mysensors.org/build).
Attention: the actuator PLA parts rather aren't resistant for a storm or a strong wind! I plan to use a