One thing that's gonna matter is how well the fins "connect" to the baseplate. If you look at Cathar's design up close, I'm betting you'd actually find a small radius at the bottom of each "slot". This is preferable to having a sharp 90° corner where the fin meets the base. Just from your sketch, it looks like you would have a higher ratio of "white space" where fins don't sit atop the die vs Cathar's design.
PITA to manufacture, but would obviously look pretty sweet. If I was a bettin' man, I'd still put my money on Cathar's but doubt what you've drawn would be very far behind if you can get it made.
Best of luck to ya Ben.
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