Need help Identifying this EDM

I recently acquired a used EDM from an auction (no documentation or any other info). It has three parts: a control box, an aquarium size tank and pump, and a electrode feed structure with a motor driving a fine pitch threaded rod and limit switches. I started creating a schematic of the components and doing some internet searches to see if I could find the origin of the design. I learned that there was a design by Langlois. That caused me to think, how many other designs are floating around? How can I find if my EDM is based on one of them. So I thought I would ask for your help.

The following three photos show the control box. Does anyone recognize the elements of this design? It has multiple switches to add capacitance? There's a PCB for the motor control. Does anyone have schematics for the various homebrew EDM's. Does anyone sell PCB's to go with their schematics.

Thanks for your help,
Joe