Really like the story so far. I'm intrested to see what all you do with it. With the way you have Harry acting towards Luna I agree that a H/Hr/L isn't impossible with the setup you have created.
I also agree I think JK wrote a very odd interpretation of some of the Weasleys. I don't know if it was her intent but I was always learry of Molly, Ginny, and Ron like they were using Harry while the twins and Arther I always felt were good chaps who had Harry's best interest at heart and not their own....
Regardless Keep up the good work and can't wait to read more.