Exterior, Gable RoofLine, Cabin Building Type, Metal Siding Material, and Metal Roof Material Instead of installing rooftop solar panels, Alqadi and his friend and partner in the venture, Hillary Flur, built a “solar tree” to provide energy.  Photo 8 of 13 in These Tiny, Off-the-Grid Cabins Near Joshua Tree Look Totally Apocalypse-Proof