The structure is something like what is made by enclosing a protruded sotomawarien (a narrow veranda all around a room, outside the sliding storm doors, used for viewing the surrounding area) with walls or boards.
張り出させた外廻縁（遠望のために部屋を回周した濡縁型の縁側）を壁や戸板などで囲ったようなものである。