Again, I have to thank you Bill. To me this is like opening another door of which I did not even know it existed.
I will study both the site (yubagold) and the pdf. I am however not yet in a knowledge state that would allow me to make sensible comments on it.

Btw, I have pretty much decided to make the CNC machine -that I was planning anythow- sturdy enough to also handle grinding/polishing forces. That does not impact my schedule too much and at least gives me the option to start experimenting with CNC grinding/polishing whenever I feel ready.