I decided it is time for some safety measurements. While cutting every now and then some smoke bubbles emerge from the water. And sometimes one can smell metal after one of those bubbles burst.
I don't think this is something that should be inhaled and decided to move the whole build into a mylar tent with activated carbon air filtering. The mylar also helps reducing EMI noise which is a good thing.
It looks cool and will make a great setup for future videos with an even light distribution.
This is the naked G-EDM prototype: