It took me a really long time to convert the mill. I did it the hard way by putting the x axis ballscrew inside the carriage. If you look up ProCutCNC. they have a kit. I would not trust them!! I converted my PM-25MV with one of their kits and they lied about no saddle modification required on purpose to sell more kits. Ended up using an angle grinder since I had no other means. The ballscrews were garbage too.
Anyway, their w axis ballscrew is on the backside of the cariage. This would be much easier but I think it puts a lot of stress on the BS. My way is difficult, expensive and takes longer.
I have the files ready. I will try to package them and email. Pictures to come soon.