In the case of Mobile Industrial (Santa Fe Springs, CA), they didn't have a means of deep-drawing the aluminum sheet; so they went with fiberglass similar to the
Airstream Argosy that used painted steel end caps.
I just wish they'd used fiberglass for the shower stall. A square-cornered aluminum box doesn't drain well. I have a fiberglass stall to replace it but it will require some modifications. A steel kitchen cabinet to replace the plywood one come first. I should post here if anything happens.
Quote:
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...prefab home assemblies...
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Buckminster Fuller's sparkling Fly's Eye Dome unveiled in Miami | Inhabitat - Green Design, Innovation, Architecture, Green Building
Each [identical] fiberglass part has three curved edges in tangent and three short curved edges in the normal direction.