Originally posted by Fzanco:

In black forest there's usually burial tombs and troll caves, the entrances can be used as shelter. Chuck a workbench somewhere, put a bed in the entrance put a fire somewhere and now you can sleep, min materials 5 stone 20wood if you can find a landmark that gives shelter. Technically min materials 5 stone and 18 wood if you dismantle workbench and don't want to bother dismantling bed

yes and they stay empty only for the mushrooms once completed.
My recipe of the hut
4 wood wall halves.
2 wood walls 45 degrees
3 thatched roof 45 degrees
2 thatched at 26 degrees
campfire plus bed if needed