Metal sheds; non-portable metal buildings; portable buildings made principally of metal; portable structures of metal; metal modular building units; modular metallic structures; modular portable building structures (metal); modular portable building units of metal; modular portable buildings of metal; modular prefabricated steel framing; modular shelters of metal; modular shelving (structures) of metal; modular units of metal for constructing prefabricated buildings; modular units of metal for constructing relocatable buildings; modular wall panelling of metal; space frame modular units of metal