How to build 3 different kinds of recipe card boxes

The idea with these boxes is that you write your recipes on rigid cards and then keep them inside the box. When you want to make one of the recipes you take them out. Then you slide the card into the bit at the top, that then keeps the card upright. This setup makes the recipe easy to refer to as you cook. With the 3 boxes he uses 3 different kinds of woods, 3 different joinery techniques and 3 different accents.