I may not have the right understanding of "skived", but anyways...
You're on the right track. The challenge is going to force the flow between the fins, and that's going to mean keeping the lid right on top of the fins, or at least very close.
At this point, you've probably already thought about some kind of manifold, to allow the water in and out. In one side, through the fins, and out the other. Right? Right...
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