First #K118 style book bound! I'm gonna call it a partial success.
It's a success in that it its a solid book that looks and feels great, opened well and should last for a while.
It doesn't quite to the K118 fan-open-freely thing, I suspect because of the materials used. I used paperbacked bookcloth and a rather thick one at that, to line the spine and cover the book. This made the spine stiffer than it should be and make the book throw up less. (#bookbinding terms, gotta love them... XD)
So next time, it will be leather or filled cloth only. And you can bet there will be a next time because I'm very into this structure!