I'm glad you liked the balance of Muggle science vs. Wizarding magic. I really wanted to explore a post-DH world that's as canon-compliant as possible, and since the book never said outright that Eileen Prince isn't alive, I took the liberty to give her a bunch of cameos ;)
And yay for finding Ginny tolerable! As long as she doesn't get in the way of my Snarry, I don't really mind her. *g*