I have a 350, and a 650, and an Oberon cover for my 650. The Oberon cover has about 1/8" of edge sticking out around the 650. I took my 350 and set it on top of the 650 in the cover. With the 350 pressed up against the center spine, there is about 1/2" of cover sticking out on the other three sides. It's the same on all three sides, so it would look fairly well balanced in there. I think it could work and look nice.
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