you are on the right track. If you can get the spec's of your stepper motor, you can build a controller using geico stepper drivers (they run around $115 each) and with mach3 you can be up and running, I have used mach2 and mach3 and around here there are alot of folks using it. But the real question will be to find out the particulars of your stepper motors as far as the current and voltage and build your power supply and controller to suit. Of course you may have to rewrite your code. There are a couple of good tutorials around that will show you and help explain how to build the power supply and so on.