Step 1: Put the boxes together

The first step is to put the two boxes together.  Simply lay one of the boxes on the side of the other box and glue together.  I used the blue tape to hold the boxes together while they dried.

The boxes I used had handle holes, so I added some cardboard to the sides and the inside.  This covered the holes as well as added strength.

I also added a thick piece of cardboard between the two boxes and on the top for strength.