Well it's unlikely anyone has converted that exact machine, but there are usually lots of generic similarities. It would be hard to comment without knowing the exact type of drives and controller, can you give part numbers? Since it sounds like the machine already works, are you sure there isn't a config problem with the existing software? And why would you need a Smoothstepper if the machine already works, could you just upgrade the controller to Mach 3? More information would help.