Single Size Murphy Bed Plans DIY Hideaway Vertical Wall Bed Building Project. The plans for this Single Sized Murphy Bed includes a Material list. For a twin mattress size. This is designed so that you do not need to buy an expensive metal frame. You build everything yourself. I absolutely love this design. I have one in my office to be used by guests when they come. I have 6 of these in my cabin. It is great, they look good when they are folded up and at night, I have an extra 6 beds that can pop out when I need them without taking up space during the day. I even have one in my ice fishing shack!