I decided to go a different route and just get the DMM Tech 900 watt 3 axis ac servo kit. It seems more elegant than doing the dc servo route. I will post more after stuff arrives. In the meantime, I am going to tear down the mill and cut the oil grooves and look at ballscrews.
The ac servos are 1000 rpm vs 3k for most of the dc ones I have been looking at. What tpi should I be considering for ballscrews?