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It's worth noting that this is for a standard self-ended picture book. So it's got 40 pages, but the first and last page are glued down to the cover boards. Also, in my experience so far, typically pages 2-3, and 38-39 are the endpapers. And 4-5 are usually for copyright and a title page. Of course these rules can be broken, but it's most common to have just 16 spreads to use for the actual story. Just something to keep in mind. Also, the dimensions here are for a book with a portrait orientation, but of course landscape, square, and anything else you can think of is possible.