I may be talking out my other end on this, but I don't think a laptop will control a mill. If what I once heard is true, there is not enough computer "guts" to power the mill path. That is said in my words not the technical terms I heard it in.
That said, go for it. But make sure you have control of the quill. I have a SMX-3 Trak retro fit and the Z axis is not a true 3rd axis. I may have been mistaken in thinking it was when I purchased the package. I have to work around the fact that the Z is not completely controlled.
Mentally confused and prone to wandering!!