I have used this thin stuff in small units and I didnt notice any warping but I wasnt really looking for it either.
- I suspect that machining will be better with the 16 guage stuff.......
Once resonance is achieved it should run pretty cool - shouldnt it??????

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Tj4440 - wont the holes through the sides of each cell 1/2 inch below plate height cause Electrical leakage ??
The concept of using a plexiglass rail to feed the cells is great - but I feel it needs
to be above the plate height and use a level sensor to turn pump on / off
to fill.
Glenn.