Designed/Printed a plastic Mobo Stand-off and used nylon screws for pure isolation and no chance of ground noise, plus super easy/fast install.
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If it works!
I made an enclosure for one to use separate from the table.
Would you care to share the STL?
Tom, that is the EXACT same enclosure I have just got in from Amazon (except, mine has the box cooling fan (with temp control, din rail mount) inflow/outflow with small filter. I am using “Glands” (like you have done as well, for my other table connections. I also have an Switch box for some other controls I am adding. On your display box, did you move the Plasma’s display to that surface and I am guessing the voltage/function knob as well?
I bought the Bud Enclosure and made my own mounting plate (using the Plasma Cutter for exact hole placement 
The second box on the edge of the table is my THC system. I have an original 2X2 system and added my own Z, IHS (actually Ohmic Sensing), and THC using the THC3T-02 module. The panel has its readout and Target Voltage setting. The mounting brackets were also cut on the table.
Here’s the inside of the big enclosure.
And the THC Unit:
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I’d just pull off the controller and measure it. Should be able to knock it out in minutes.
Edit: since I can’t find my controller right now, maybe you can use my STL from Makerworld so you can gather the hole distances
https://makerworld.com/en/models/2015877-langmuir-controller-enclosure?from=search#profileId-2172068
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