Heavy manned turret was a model of heavy stationary defense quad cannon battery that was used by Sith Empire during the Great Galactic War and the following Cold War. It was about 23 meters long and 10 meters tall. It was operated by a single gunner. When a compact solution was required for defense - for example, to install a defense perimeter inside a building - the Empire used a 5 times smaller version of the tower of the same design.
It was similar in size and configuration to a fully automated quad autoturret

Quad Autoturret Ground Vehicle Structures

which was used by various factions.