content: Whatever the logic for using oil cans, it is more a sign that all sorts of fraudulent building practices were put into this building. Kind of like you can build a wall out of cinder blocks, or you can put down some posts, run chicken wire between the posts, and then cover the wire in plaster and it will look the same but will be much cheaper. But over time the cinder blocks won't lose structural integrity like the wooden posts and chicken wire.