[X] In the broken hills.
Sounds like a logical way to create something adequate. Of course, heavy ground will complicate the work, but we are waiting for rain, and, more importantly, snow. If it's cold enough, the rivers will freeze and we can use the sled to drag the ice reserves into the basements, creating an ancient refrigerator. The water problem will be really important in case we find ourselves under siege, and it is not particularly noticeable that our opponents can afford it. Wargs are literally a pack of animals, goblins are hunter-gatherers and sitting in one place for a nomads threatens to deplete resources.