One option is to check with Larken Automation, they supply complete tables as well as component parts and software to retro-fit etc. Their machines run off a standard PC (printer port).
I have installed their machines for customers and all are satisfied, I believe you can still download a sample of their software that will convert Corel and .DXF drawings.
If you have the steppers and they are compatable with the Larken, it may be the cheapest way to go. The original owner, Larry Kenny designed and built the machines as well as wrote the software. (he also designed the electronics)
Al
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.