CNC mill conversion G0704 Grizzly – cheap

I am in the process of finishing up a cnc conversion of my 4 year old grizzly g0704 mill, trying to do it piecemeal and low cost. Decided on the TinyG as I did not want to invest in having to use a parallel port computer. This also freed me up from buying mach3 and allowed use of my laptop to keep things really convenient and inexpensive. Along with tinyg, used 3 of the 425oz 2.8amp steppers, and made all my own brackets, trying to keep the parts count low, simple, and cheap. I originally used the stock acme rods and proved out the concept, but once that worked, I had to upgrade to the ballscrew version. So conversion costs were about $130 tinyg (no extra mach3 or parallel port computer) 3 steppers @ $50 apiece ($150), eventually a ballscrew kit at $200 which is optional, and various hardware, mostly oldham couplers at $60, angular contact bearings (only for ballscrew conversion) $25, about $30 in Z axis pulleys and belt, for a total of about $400 for the stock threads and $700 for a ballscrew converted version. So far its looks like the tinyg has enough power for the 425oz steppers and machine. It also leaves me one more axis for a horizontal rotary table if need be.