although.. just thinking about it, i *could* do kinda what you are talking about... makes for a quite interesting assembly, but it's possible... i could build the finned setup on top of a cross-drilled base, which the pump would pull it's intake water through... that might actually be more efficient. this is assuming you understand what i'm talking about. basically, looking at it from the side, you'd have thin coldplate->radiator-like flow through inner block (but would be thin as possible)->exchanger tubes.
have merit?
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:shrug:
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