I think you've hit the nail on the head about some problems that you and Luke may face: defining your vision for recipes and how to get potential authors to follow the golden path. That's sorta why I signed "my 2c": it's really up to you guys, as managing editors of your book, to make the choices about goals, tone, and style. (I do like being asked my opinion, though: good management style on your part!).
   regards -t