The standard export version of the goalkeeper 1 can be augmented to fix in "box" type emplacements to save space on ship, similar to versions of PHALANX. The only components on the individual system that need under space include ammunition and mechanical equipment. In this design all CWIS control is centralized within the command of the central AEGIS type command. If need be, the under portion also contains an individual computer control module. I am VERY sure this would work!
you could only fit the GK in/on that turret if there were no guns in there. you need an substantial magazine, reload room and cooling space.
phalanx, on the contrary, would fit: that is an bolt-on system. the shockwave of firing the guns would catapult it off though.