One of my first projects was to design a DIY-funiture to build with usual tools and materials form the home depot. The idea about the removable seating and seat back is that it is possible to transform it from a chair into a table or the other way round. Only four steps are necessary to turn it from one into the other: you just have to remove the seating and put it on top of the base frame to form the table. It is a really space saving design with a high flexibility.