When i bought a 12000 cats. house in brink (the one that is next to a mountain peaks foot to the right when you enter town) and tried to build anything inside there the objects tilted parallel to the mountain wall and were kinda.. well you see in the pictures. I could build only on about 2/3 of the space properly. Also i cant walk to one corner of the house, ill send a pic of that aswell to make it clear.
Here are the pics of the situation..