I just started, but so far we have a smeltery + vine farm in a cave, a minecart track down to a mine, a farmhouse with crops and flowers, an apiary (automated to collect honeycomb + honey bottles!) next to that, the foundation of a collosally large clocktower that we (I'm working on this with a friend) hope to be a central structure to the whole house, and a dripstone clay farm. And a bunch of chests hanging out. I like to collect music discs from creepers so we made an auto-replay jukebox to cycle through discs while we work!