So this book is pretty simple. It is essentially two books put together, and therefore one difficulty is that it is the same amount of work as making two books. You can do any binding; I did a cord and case to demonstrate this idea. Making the text blocks is the same as usual, but as you go to attach the covers, attach them facing opposite directions to make the dos-y-do book. The outside covers need to be around 1/8th of an inch longer than the center board so that all of the covers line up. And that is pretty much it!