I looked at the book quite a bit on-line and did not see any mentions of the cover quilt. It does look like a pretty good book all in all. Not a bad choice for a quilting book but not so good for that particular project!
I'm drawing a blank on the name... Birds in the Air variation? Lady of the Lake (variation)?
I've drawn out the basic block and attached that below, maybe someone will be able to find you a project on this.
Back when I started mostly all I had were block diagrams and no instructions.... things are better now if we can find you directions. We can, if you really want to get you started but it would be a lot more comfortable if we can get you something well written.
Me, I'd just babble and rattle off something about incomprehensible about being large and half sized HST... (HST = half square triangle.)