Liam,
Keep in mind that G11 is the easiest mount for OnStep conversion. GM8 is a little more complex, but also not hard. Look for reverse worm design for GM8 on onstep forum, it seems to be the simplest method.
There are several options for building OnStep which require very little soldering:?
1. MKS Gen L v1
2. MKS Gen L v2
2. CNC shield + ESP32
I have 4 mounts converted using MKS Gen L? 1 - it is very cheap and easy, and works fairly fast despite old processor.
The biggest challenge for me was to reduce the diameter of the coupler because I do not have easy access to a lathe.
If you have a challenge programming board, let me know, I have some spare boards which I can program for you and provide at a fair price.
Alex
