A brilliant yet deceptively simple idea. I'll submit one today or tomorrow. I haven't played Oblivion all day, though, so I'm raring to go smite my foes. I'll see what I can do about building you an interior in a few hours. It's nubile stuff, and repetitive, so I understand how you'd want help with it.
Thanks demonsshade, you don't know how relieved I am (One house less...yes!)
That reminds me, I want to warn you about one thing in London. You might notice that some of the houses look a little alike. That is because there are so many houses that I'm just mass producing the generic ones. That means I take one house, copy it, rearrange the furniture and add new misc. items and decorations, add new NPCs, and move on to the next. This way, I save time.
Two reasons for this:
1. It's probably how it was done in 1200.
2. C'mon, do you really want to wait for years for this mod to be released?
BTW: In case you haven't noticed, I'm only on for an hour or two a day. So, please be patient if I don't send you an "I got your email and I've added (or, God forbid, rejected) your house" response right away.