Give us some details on the size and spec of machine. Most of the software you need you can get for free, the only one that is a bit problematic is cam. EstlCAM is available at a cheap price and will get you up and running at £20 i think?

In the mean time try black a few old 'A0' plotters as these will yield some nice nema23 motors. Looking for them in modern printers is a little hit and miss. The motor mounts you can get away with a couple of bits of plate, a drill and a bit of rod to make stand offs. Do you have bearing mounts etc.

Let us know exactly what you have and we can get you going :-)

ps

Power supplies can be salvaged from the plotters too and may get away with a cheap Chinese controller board?