You and Caitlin have done a really wonderful job with this fic. I'm having a really hard time finding fault in something that's clearly been planned in great depth. The most advice that I can give is to be careful to stay on track. Lord of the Rings was written to develop and explore a world with rich history. One of its greatest downfalls was the disproportionate amount of time it spent on world-building tidbits with zero relevance to the story. Like I've said above, I like what you're doing, but sometimes less is more. Just a thought. I'll definitely keep reading!