What a fascinating narrative structure! I don't think I've ever read anything like it. It could easily have been confusing, but you mastered it so well that it never was.
I loved the way you used canon (particularly the scene where Harry is chosen by his wand) to weave into the story. That's a really interesting place to choose to end it, too.
Pomona was brilliant. A real modern, independent woman. I'm so glad that Garrick worked her out in the end.