The Beh'Vak class construction yard is a structure that is built during the colonization of a planet by Klingon forces.
While their appearance may make these structures appear incapable of producing advanced technology, they are actually quite efficient. They are industrial monsters that constantly produce the needed requirements for the colony by producing the necessary raw materials. This helps in the production of newer components for the growing colony. These are then produced in magazines which are shipped out by worker bees. As the colony grows, the more advanced technologies allow for more efficient designs to be accessed. (TOS video game: New Worlds)