How would that work? Strike Cruisers, per an example, have forty weapons emplacements. They are roughly 500 meters long. 40/500 = 12.5 meters of hull per a weapons emplacement. ISDs have 130 weapons emplacements, including tractor beams. 1600/130 = 12.3 approximatley. So 12 meters per a weapons emplacement looks to be the default. With the exception of smaller ships, like the CEC Gunship, with 90 meters of hull, and 20 weapons emplacements = 4.5 meters per weapons emplacement.