I built the v3 rotator a couple years ago still use it today. The build files for the 3d parts are here. I opted for driving it with an arduino uno/cnc shield using @quartapound’s code here referenced this thread from 2019.
Further development of the satnogs rotator does seem to have gone stale but it’s still a relatively cheap (ish) way to obtain a az/el rotator. Checkout Yaesu 5500 ($) or Spid RAS rotators ($$) for more expensive COT options.
Good luck!