This box was the third one I started but the second one I finished. It takes a three step process to open it, and it also has a "secret" compartment on the inside which can be accessed by pressing a "button" on the outside. I used a computer to design the inside of the box, then made a list of the pieces I would need. I ordered most of the pieces from BrickLink. This is the only box I've made that doesn't have "feet."
