What I can read is really, really good. I'd like to spend more time on it right away, but can't. Well done!
As a quibble, I'd like to suggest more background in the book about the AU itself, though like I said I can't spend enough time on it to finish reading it cover to cover right now.
I'd also like to pout, and suggest you and Marauder648 need to do the layout on my next projects. I can't help but wish I had the kind of time and effort available to you guys, but until I retire it seems unlikely.