Ben's point regarding aluminum's corrosive propertys is quite valid.
This of course brings us now to the thought of making use of stiff plumbers copper tubeing for the frame. Round tubes would be harder is some other ways to use regarding attachment of the case sides ect. But copper would also be a better dissipater of heat from the water.
By biggest question is regarding just how much cooling you could hope to gain as the inside case temps are going to have a very pronounced impact on cooling in this tubuler frame.
but a interesting idea none the less.
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