A ring-like section around the gun is connected to the gun and fire control room by a pair corridors running from the gun to the edge of the 'ring'. The platform is centred around the primary armament, either a Super MAC, a THOR Laser, or two ion cannons.
The Oranos-class Orbital Defense Platform looks similar to the older Human-Covenant War-era orbital defense platforms. The Oranos-class Orbital Defense Platform is a class of UNSC space station. ' That MAC gun can put a round clean through a Covenant Capital Ship' ― Avery Johnson