Attach these side pieces to the insides of the carton. Cut a second set of these side pieces and apply them to the outside. You might wish to allow a slight overlap to insure no gaps and to go over the top edge. Cover the bottom cardboard piece. Cover the dividers on all sides with either the paper or Contact Ultra and any little boxes you might wish to insert for stamps, paper clips, etc.
Return dividers to position and hot glue to secure.