Love the group hall so far, but I think what would make it the best would be the possibility for expansion. Instead of 3 machine rooms, just have 1, since that's really all you'd ever need, I think. And then have the ability to "purchase" (with currants) new phases for our street to expand it. Things like, building an herb garden and farming plots, or adding in a cave with a dark patch or two. Or building a cabinet for group storage, perhaps. Things like that.