Just a thought, I do like the idea of an etched pattern on the back plate. I am thinking I may be able to setup 2 templates of the same pattern, one for cleaning off the black painted area and the other for etching the pattern, earthing shouldn't be a problem, simply run a screw through one of the mounting holes and earth wire that in, but also depending on the paint that's been used on the plate, i'm not sure if running 12volts over it may cause it to bubble and/or peel.
There are other ways to etch surfaces as well, air eraser air brush and compressor using a fine grade aluminium powder. I have been researching this method for other projects. Essentially, can be used for etching just about all surfaces without the need for electrical chemical current. Low 45 PSI compressor and a Paasche Air Eraser and fine grade aluminium powder.
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