Look inside the cutout on the back where the compressor is. You may have 1-2" of play. I'd remove the compressor first, before I start whackin' on the hump with a mallet.
Not to start a plastic vs. glass debate, but im sure you could fit a 10G plastic ferementor in there. Or maybe even a stainless conical. but for that price you could get 2 more chest freezers
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