You don't need no stinkin' sofa! Put some nice fluffy cushions directly on the floor. Take that futon cushion off the frame and fold it against a wall. Add pillows and blankets. The options are endless!
The supports are long steel bars that go through the shelves and into the studs in the wall. We predrilled holes for them before we tiled. We used oak planks seamed together to make a solid wood shelf." I love the hanging coffee mugs.