Consider what the steel is actually doing on a build like this one. Corten walls, corrugated, thin enough that the corrugation is doing most of the structural work. Somebody has cut two large rectangles out of one side for acrylic windows and welded in frames. The floor has been reinforced. Water goes in, and now every wall is carrying hydrostatic load it was never designed for — the corrugations want to bow outward, the welds at the window frames take the concentrated stress, and the whole box racks a little every time it gets lifted, hauled, or set on ground that is not perfectly level.