Rent to Own Cabin Shells are typically made from wood, steel, or vinyl. Each solves a particular problem and each has a distinctive look. They are generally fastened together with screws and come in kits. Some are pre-built, delivered as a kit and assembled on-site by the provider. Some you must assemble yourself. Some have floors, but usually you will need to pour a concrete slab to provide a strong and durable base for your shed.