Grid beam is a modular, reusable building system that is fast, easy, affordable, and virtually goof-proof. Ordinary people with few skills and even fewer tools (all you need is a wrench!) can tackle projects ranging from furniture and shop benches to more ambitious projects like wind turbines, truck racks, small buildings—even electric vehicles. Grid beam’s modular pieces and bolt-together construction make the system fast and straightforward to work with. It has all the advantages of an industrial building system: standard, modular sizes; uniform materials; and interchangeable parts. Projects knock flat and are easy to transport. Since the pieces can be used over and over again, grid beam is easy both on your wallet and on the environment—the authors have been using some of their components for over thirty years.