I looked into this a year or so ago with the idea of making my own mechanical watch movement, not just a kit watch. I could only find one source of a hobbyist doing this themselves: https://ashtonwatch.com/2012/01/04/its-alive-and-a-bit-of-a-...
https://www.openmovement.org/?konzept
I'm a watchmaking engineer and I know two people on the project, I'll be pleased to tell them any feedback.
By the way the watch you linked is a clone of Unitas 6497, the work is awesome nonetheless.
https://www.openmovement.org/?konzept&lang=en
That aside, this looks pretty nifty. :)