I see where you're going.
By adding fins to the tubes, you'll increase the surface area, and the cooling potential.
It seems to me that the challenge with this would be to find the right fin spacing, or at least the right coolant flow arrangement, to prevent the coolant from freezing up on the tubes.
How do you plan to address that?
Also, have you considered lining the inside of your Alu box with some kind of rubber sealant, to prevent galvanic corrosion?
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