Well, since the site is called ArmorGames, I had a Middle Ages idea. I think these can be used as armatars or something completely different, like the Wood, Silver, and Gold rankings.
When you're at a low AP, you have something like this small hut, or a leather armor. As you advance in AP, you unlock better armors and houses, like a cabin and bronze, until you finally have a castle and a full steel plate armor with chainmail. Sort of like armatars, but a little different. What do you make of this idea?
I'm sure this has been suggested before, somewhere...anyways, I agree with plokkey, it would be just a tad weird, I'd rather see more armatars released instead of a new ranking system.
I think we should have a completely customizable character with all of the options you said, and use our AP as money to buy different things for your char.