I joined a trio-era game with this concept years ago but sadly it never took off. I hope that this one does, because I think it's a great concept for a game (and one I'd possibly join if it wasn't for the fact that I've given up communities entirely. Oh and if it wasn't next-gen. It's just not my era unfortunately).
Next gen games seem pretty popular though so I think that bodes well for your success!!
Were you planning to randomize what houses people wound up in or have players choose 'secondary' houses, as in, the house they' were second most likely to wind up in? (I can't remember how the old game was done, possibly random, but at least one of the trio wound up in Slytherin which was going to be epic.)
I'd be willing to bounce ideas around if you like.