There are also differences in thermoset vs thermoplastics; thermoset plastics are set into a shape when they are formed and don’t noticeably soften when heat is applied, while thermoplastics soften ...
Low-cost PVC vs stronger galvanized steel for the hoops. Polyethylene plastic sheeting vs rigid polycarbonate panels or glass for the coverings. Ground posts for securing the structure. Buried lumber, ...