I purchased a used Hardinge DV-59 / OmniTurn. It had only control of the slides; no relay box or VFD for motor control.
I used the published OmniTurn schematics to make a relay box and added a VFD. I removed the stock Hardinge electric panel and re-wired the motor to the VFD.
I replaced the CRT with a color LCD monitor made for a car. It fit behind the display window perfectly. OmniTurn sent me the color version of their program.
I replaced the hard drive with a solid-state drive (SSD) from OmniTurn.
I see a couple of companies make a unit that replaces the floppy drive with a USB adapter. Floppies will be harder to find as time goes on. This would be a neat mod to read programs off a USB stick.
I want to remove the dual motor belts and go direct drive for my next project. The noise is getting pretty bad.