I have had the idea of recovering these types of books for some time now. I have made a couple of aborted starts on other books, but this is the first of its kind that I have completed. I planned to build a hard cover around the existing book, and marry the existing soft cover into the new hardcover. I started by measuring the existing book, and figuring out the dimensions for my new spine and front and back book boards.
The relatively trivial material and time demands of the good Reverend's technique make it one of the most cost effective ways to create a great prop I've seen.