Hi,
got all the parts from Ebay from local suppliers - did not want to wait for stuff from Ali Express. No pics I'm afraid, but one is on an Esprit 100 and the other a 12" newt.
The motors are geared steppers - nema 17 , I'll get the model numbers tomorrow.
Another simpler one you could do cheaply is here:
http://www.scopefocus.info/scopefocus-ascom
I've built his rotator and fitted it to my Esprit 100 along with the motor focuser from Cloudynights.
Heaps of Arduino stuff for scopes - I've also done an arduino/ascom controlled flat field device from a tracing board that is controlled from both SGP and Voyager.
cheers
Gary