Put some E-6000 glue on the sanded side of the box. Place the cut end of a book spine on the glue, lining the bottom and side up with the bottom and side of the box. For the each of the next book spines, put E-6000 glue on the side of the previous book spine and on the next section of box. Stick the next book spine to the previous book spine and the box. Keep the bottoms aligned with the bottom of the box. Do this with all the rest of the spines until the front of the box is covered with book spines.