A few if you guys have asked about the Y travel you will get with the PM-30.

Stock without the Way guards is about 9.75". The CNC kits nut holder is a bit thicker so you loose a little there.
The PM-30 head is not really centered on the travel its about a inch forward which is good if you want to cut the base for more travel.

The 30 has a lot of room to cut the mill. If you want to run Nema 34 motors then you will hit the Y mount if you cut over 1.35" it will bottom on the Nema 34 mount which you dont want.

With the mill cut at 1.35" from stock the open travel is 11.5", which is great for a smaller mill. For Nema 23 motors you can cut to 2.2" and the double ball nuts will still be OK. That is over 12" of Y. Kind of crazy for a mid size mill.