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I just designed myself a shelf version using the blank one and TinkerCAD, it prints on a 400 by 400mm print bed and stands around 350mm tall when assembled. I redesigned the hinge so that it can fold flat (this isn't print-in-place), and it has a sign meme on the non-shelf side. It can hold 16 of your signs printed at 75% scale, if I was to scale this so it fit the full sized versions of your signs it wouldn't even fit on a 500 by 500mm print bed. Attached are pictures of the render. If you want the STLs I can send them to you, but I respect the NoDerivs license so I won't be publishing this design.