It's handmade with a Japanese stab-stitched hardcover binding. I was looking for a cover that matched the sofa in the picture. I couldn't find one, but worked out with normal bookcloth the time limitations, imperfections and design flaws of a handmade book more than matched the dilapidated state I was trying to recreate. It's not perfect in other words.
If you would like a copy, they are £60 - made payable to email@example.com at paypal. Postage and packing is included in that.