Granite surface plate based CNC mill

A few years back I built this CNC mill from a granite surface plate and had to store it right after it made its first moves. I just got it back. It needs some love and I can think of a million improvements based on what I have learned since then. Some of the information here will be a retro-build log of sorts, explaining some of the decisions and methods. But also moving forward I'll cover changes I make from here.