It's a very simple concept, but it takes a lot of patience to make everything work properly. I didn't bother to show 95% of the "fit" process because that would make for a very long, very boring video. Lightly sand, check, repeat... its very time-consuming.
The sides are Walnut, the rest is Cherry, the key is Purple Heart. For the hinge, I used brass rod and the finish is shown in great detail in one of my other videos (link below).