Ok,I will fix the stern.But is possible to have the 127/54 on this ship or should I replace it with an 76mm?
Given that you will need the bow ramp for loading/unloading of vehicles and equipment, it might not be possible to have
any weapon in that position. For multipurpose self-defense (small boats, CIWS, etc) it might be possible to mount a 57mm gun on either beam, but this would mean narrowing the ramp and creating a 'bottleneck.' Perhaps change the single 127mm gun to a pair of 57mm guns, located where you have the canned liferafts immediately forward of the superstructure? If they are mounted in an elevated position, this would give them decent combined fields of fire over about 2/3 of the horizon.