CVMichael: Is that CNC machine still a live project and if so are you still looking for help / ideas for it? I'd be up for that. The pen plotter I'm working on (two and a half axes) should eventually be able to draw etch resist pen onto blank copper-clad boards and then drill out the pads before etching. Have you tried to do this with your CNC machine?
I'd love to compare notes about this kind of thing if you're still interested in this stuff.