here is what i was contemplating by channels, hacked up your drawing really quick in autocad so the numbers aren't correct, if anyone want's me to redo it correctly let me know :P anyway here is a jpg of what i was thinking. the one main problem i see with doing it this way is that to get flow correctly the openings on the end fins will need to be larger than the inner ones to get flow correct, but i could be way off with even the thinking of this design.
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