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First, my English is not so good for detail describe the machine.
Basic ideas I find on Luberth Dijkman's site.
The steppers (12V dc, 1,8 per step, unipolar) a from 5,25" floppy disk drives.
The X axis was built of an old HP ScanJet.
With small program writen in QBasic and 3axis stepper motor driver with ULN2803 ic's via the parallel port, motors work separatly.
I hope that with your Software the three axes will work together.
I use Windows 98 (Second Edition), AMD-K6 processor, 32 MB RAM.
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