Few novel ideas are any good raw.
Let's dispense with the sheet metal case sides altogether - and build those sides out of radiator. We could have two radiators/side walls, or a single rad going up one side, over the top, and down the other side.
Delicate fins would need some kind of cage to protect them from mechanical harm... this is looking bulky.
Maybe lots of square tubes which are cheap and readily available (say 1/4" thick, brass or aluminum for toughness) bonded side-by-side to form a solid wall? I'm imagining something you can get as a sheet good and cut to size, then cap off with a simple kit.
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