A recreational vehicle may comprise a cabinet structure in contact with a horizontal floor and one upstanding wall, the cabinet structure comprising a plurality of generally planar side panels, each of the plurality of side panels comprising a plurality of mounting apertures extending from a first panel face to a second panel face; and a plurality of generally vertical and generally horizontal ribs extending from the first panel face, the second panel face, or both, wherein the plurality of generally vertical and generally horizontal ribs are interconnected, such that they together define a plurality of sub-panels arranged in a grid, and at least one of the sub-panels of the grid comprises at least one of the plurality of mounting apertures.

A display case can include panels, and frame members (e.g., corner extrusions) that secure the panels. In some examples, the frame members can magnetically secure the panels together in an assembled configuration of the display case. In some examples, the frame members can cooperate to provide improved mounting and demounting processes.