Easy Diy Diy Sofa Bed . This particular design uses a very interesting base. Easy & simple wooden bed frame: 40+ Super Easy DIY Couch Ideas You Can Try from definebottle.com This diy sofa transforms into a bed and is way more comfortable than most convertible sofas since the design is based around a tuft & needle twinxl mattress. The base should be formed of 4 planks of wood arranged in a square, like a picture frame. Cut the conduit to the proper length and insert them in the 1” holes.