I'd like to see how the external rad box turns out. That sounds like it's going to be pretty big, especially if you're running the radiators in parallel (more frontal surface area = bigger box, one would assume) with double-walled construction. I'm very interested to see how it turns out as far as your noise levels. If you can somehow post a drawing of your design, we can help you fine tune it for the best cooling/sound capabilities, if you'd like.
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