Looks like a couple people already wrote the book I was thinking about creating: Appalachian Pages, a thru-hikers' guide for the Appalachian Trail. The real winning idea here, the one that I wanted to see, was having the elevation profile watermarked on each page so you can sneak a peek at the day's challenges in a glance: 
Thank God they saved me the work. It looks great. If I ever end up on the AT again, I wouldn't be surprised if I carried this book instead of the classic AT Data Book.