There are plenty of metal-walled houses mate... down under we call them sheds, fair dinkum. https://www.google.com/search?q=metal+clad+house+australia https://w

There are plenty of metal-walled houses mate... down under we call them sheds, fair dinkum. https://www.google.com/search?q=metal+clad+house+australia https://www.google.com/search?q=metal+clad+house+australia (Thermal transfer properties are notably different from traditional building materials!) Plastic modular houses ... not quite houses but used structurally where providing novel utility. For example they fill two-part fused thermoformed plastic containers with water for crowd control in riots. Recently half of Hong Kong was filled with these. https://www.google.com/search?q=water+filled+barrier https://www.google.com/search?q=water+filled+barrier