After seeing this first post, I quickly ordered the book and read it over the course of a couple of evenings on the patio. I learned a lot and thoroughly enjoyed it. I thought it was really well done and had just enough details to satisfy my curiosity and tell the story without going through every minor change to every model. I also appreciated seeing some of WatchFred's collection. If you enjoy the Navi or want to know more about the model, I highly recommend this book.