I have owned this mill for almost 2 years and have just started my cnc conversion. Wanted from the start to use linear rails. Did not realize what I was getting in to. But this is my progress so far. 25 mm double ballnut and screws from hiwin. 20 mm hiwin rails for XY and Z. Hgr20cc heavy duty bearing blocks. I wanted to keep the integrity of the machine by leaving the dovetails intact so that the machine could be put back to a manual machine. I have the Y axis rails set up. I am eliminating the saddle and using a 3/4 inch piece of 6061 aluminum. Machined pockets on bottom and will add another 2 inch thick piece of 6061 on top of that to bolt the X axis bearings to and the Xaxis rails will go on the bottom of the table with aluminum spacers just like the Y axis. The Y axis is very smooth. Thish as taken me a while to do this so far because I only have the one machine I have to take the machine apart to measure and put machi e back together to machine and so on.