Hmmm you wont fit a missile launcher behind a helicopter pad. It is dangerous. Either you made the H-Pad higher or the launcher lower.
why would it be dangerous? helicopters come flying in from the side on all ships except carriers......... so where are you basing this on?
You don't want a heli deck that's cluttered with equipment, full stop. Get a bad cross-wind of ship rolling at the wrong moment and your helicopter could go straight into high explosive missile launchers. Not good.
I would move the move the gun forward, to take advantage of that clear space on the bow, then slot the missile launchers in between the gun and the bridge superstructure.