lid of the storage box and marking with a pencil where I wanted the lid to be. The lid is a little longer then the box but not as wide as the box so it gives ample work space without taking up too much room. I then used an industrial strength adhesive on the back of the shelf and attached it to the lid, matching up the edges with the pencil lines. As a side note at first I tried to use Gorilla Glue and it held for a while but did not stand up to the rigors of a 2 and 3 year old, so I tried again with the E-6000 (which I got at Michael's) and it worked much better. You could also probably screw them together but that would involve charging the drill and well you know how that is.
I made two separate work spaces one for the Bean and one for the Bee. I filled the Bean with blank paper, coloring books, lots of markers, crayons and colored paper. The Bee's was filled with all her favorite puzzles, which we keep in Ziploc bags. The girls love them, sometimes they use them as a work space and sometimes just as kid accessible storage for their favorite items. They roll around so we can move them anywhere and the close up and store away when we are trying to clean up. The thing I like most is that they could be used for anything, as the girls grow and their interests change we can easily swap out the contents. If you have a Lego lover this might be great for those too!