and a garden. . and companions barn . . 
Those may be added in future updates, but still, probably a few years later because the game isn’t focused on the sandbox features. ToS is more of an exploration game to me and it should focus on that as its biggest “weapon” to increase its popularity and gain more active players.
A sandbox barracks sounds lovely but, I want to expand outside the box and hop for a sandbox world, like planting and harvesting in the outside world and a little mechanic for letting us know which areas would grow this and that plant the best and which areas are unsuitable~