I've always wanted to make one of these, and nothing's more painful than an itch you don't scratch.
Step 1: Materials and tools
- A hardcover book. The bigger, the better, but it NEEDS to be hardcover for strength.
- A knife or razor. You'll need this for various trimming and cutting jobs.
- Glue. You could probably get by with just white glue, but I used three different kinds.
- A brush for applying glue. Try using something you're willing to toss, not your nice painting brush
- (optional) A bandsaw. This makes cutting out the hollow much easier.
- (optional) Lining material. I used leftover art paper, but fabric and other such materials will work too.
- Weight. Anything will do, so long as it holds things down during gluing.
Step 2: Acquire a book
Another author included "a book you don't value" in the list of materials and tools. I'd say this qualifies.
Step 3: Remove the cover
You could just cut out the inside with a craft knife, but I decided to try the method where you remove the cover and use a bandsaw later. In this book, I found some kind of plastic webbing and surprisingly sticky glue that I had to cut with a sharp knife.
Step 4: Glue the edges
You might want to do this before cutting the cover out, but I diluted some white glue with water at a ratio around 1:5. I painted it along the outer edges to try and keep the pages together. While it dries, leave some weight on top and go play some Minecraft in the meantime.
Step 5: Cut the pocket
I used a bandsaw for this part, which gives you a cleaner cut than a craft knife would. But getting those 90° corners on the inside means you need to cut across and give yourself some room first.
In either case, a wall thickness of about 1/2 inch should be enough.
As usual, be sure to leave the blade guard no more than 1/4 inch above your material. Safety First!