Here are pics of a g0704 cnc conversion, very simple, tried to keep it as cheap as possible. Based on Hoss's, but made most of the parts somewhat differently and more simply. Used nylon spacers as standoffs and in place of alum block parts for initial assembly and fit up, but am very happy with them so I will keep them. Used X and Y ballscrews, but left Z as stock screw. Using tinyg is cheap and saves cost, no need for parallel port computer (I use my laptop) and no need for Mach 3.

Attachment 224566
Z axis, used existing M5 tapped holes from cap, did not need to drill and tap new holes.

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Y axis, with nylon spacers and stock bearing blocks

Attachment 224570
Ballscrew Y, made bracket with two pieces of 3/8 aluminum sandwiched with roll pins.

Attachment 224572
X axis, using 1/4 aluminum plate, nylon spacers, and existing M6 holes holding the end caps on.

Attachment 224574
Y axis with stepper mounted with nylon spacers, note the handwheels to retain manual capability.

Attachment 224576