I just threw out the steppers off mine a week or two back
I can't remember what they were but I could only find info on one of them. I originally had planned to use steppers but I think I was going to go for new ones, can't recall if it was because they were not suitable for modern drives or if it was just I figured the older motors may be on their way out.
Sorry not much help but looking forward to seeing the progress, always good to see another lathe.
I still have the DC spindle motor somewhere I think, so if you want it as a spare you can have it for the cost of the postage.
Hood