This has been one of the longest, most detailed, and richly altered stories I have yet to read. While some go as far as a single book, maybe two, WH has outdone everyone so far by not only sticking to the original story's heart, but by running the majority of the series without ruining the soul of the series. Many of the somewhat confusing points and plot holes of the original books are firmly addressed and neatly closed up by Holly in ways Harry would never have been able to do.
Keep it up! Do other book series! Make the world of fiction have some true logical chaos!
Oh, and maybe consider writing professionally. You are definitely good enough.