I can tell you that in our area there will be three clans, though Sunclan is obviously the focus of our particular group. ^^ I'm waiting until this clan gets up on it's paws, before opening the other two areas to secondary clans.
As for a fourtree's-equivalent, I've been exploring a few different options. Including a small-ish waterfall with the leader stone in the center of a small pond, and a sort of... mountain-like meeting location, with the mountain's peak being the meeting place.
The moon stone/pool equivalent, is still somewhat a developing idea. I had a general mind-set of what it will be, but I haven't decided on a single, solid idea yet.
If anyone has any idea/suggestions to those two, feel free to list.~ ^^
As to a kittypet home/corner, I think we could have a few of those here an there. With that, we'll also need a thunderpath of some sorts. *Thinks/Plots* ~