This was an idea that I talked with march & choco about a while ago (except we called it Dungeons). Anyway, I think it'd be a great idea to have Maps/Dungeons here ... but I'm not sure if using Pages to represent cells on the Map is the way to go.
It's a very tough challenge -- especially to try to stick in the "book" paradigm that we have going on. But I think its doable ... just takes a lot of thought to come up with the winning solution.