Hi,
if you know a bit about electronics and coding for arduino this is super easy. I did exactly that for my SCT with an added Crayford style focuser. Just need a stepper motor (I used one with 1.8 degs per step) and a stepper driver (I built my own with surplus stuff I had lying around but you can easily get off the shelf, ready-made ones (adafruit is a good start). As for the bracket I just got a thin piece of aluminum bent to shape and screwed the motor to it. The shape will depend on your particular focuser, of course but you could easily design a 3d printed option or, even better, cnc one out of aluminum for better rigidity. For my particular case I just needed to focus hands-free when imaging the planets and such so I connected the motor to the fine focus knob with a simple O-ring I had lying around (yep, I have lots of junk lying around lol). This way I can easily detach the motor for manual focus if needed, say when roughly focusing or when using the scope visually with friends.
Now, if you want ascom compatibility then there are other options. Try googling myfocuser pro2, it¡¯s an ascom/indi focuser with many options to choose from like arduino or esp32, different types of steppers and drivers. The code is open source and can be uploaded to many controllers. I didn¡¯t need ascom so I decided not to go this route but I was seriously considering it.
And finally, there are many options to choose from if you¡¯d rather get a professionally made, plug&play type of focus motor like ZWO¡¯s EAF, Pegasus focuscube or primaluce sestosenso, to name just a few.
Hope this helps
