To build the shelf, remove the cardboard backing, mat, and plastic front protection so you are only left with the frame. Measure the inner width of the frame, which should be about 9 ¾ inches.

Lucas came up with a real winner when upcycling cardboard to use as a bookshelf. It’s visually pleasing, can be built basically for the cost of glue and a mounting brackets, and you don&#8217… ...