build a fold-down workbench. This one sets up in seconds and eats up zero floor space when not in use. The only things you'll need are a 2x4, a pair of beefy hinges, a couple of threaded pipes and flanges, and a handful of screws. For a work surface, we used a 30-in. solid-core door, but you can use other materials such as two layers of 3/4-in. plywood glued together. To set up the workbench, just screw the pipes into the flanges.