Exterior, Metal Roof Material, Wood Siding Material, Tiny Home Building Type, Metal Siding Material, Cabin Building Type, and Shed RoofLine The 301-square-foot cabin is situated on 99 acres on Bruny Island, an island off the coast of Tasmania. For the exterior, the architects have chosen materials that "comply with the Bushfire Attack Level of 19," they explain, including bushfire resistant wood and zincalume metal. The cabin collects its own rainwater—storage tanks are underground for an uncluttered look—and the roof sports solar panels.  Best Photos from A Secluded, Off-Grid Cabin Echoes Stunning Minimalist Design