I wonder why no one has drawn them!
Maybe it's time for me to start one then, if no one else is doing it.
Should draw some real designs to offset the stupidity of this one anyway.
What is the available width where your SSM launchers are sited? Is there enough to have the launchers firing outwards without the backblast tearing apart the launchers on the other side? If you have any doubt about that, the simplest solution is to rotate the launchers 180° have have them firing over the centerline, the second simplest is to build a central blast deflector like on the KDX-3.
There should be enough room. Still do have some doubts about it though so I'll add some blast deflectors anyway for good measure.
Since you have a SPY-1 and regular Phalanxes, are radar-equipped SeaRAM really necessary? Can't you slave baseline Mk.48 RAM launchers to some of the other radars and the EO directors? That would double the missile loadout just by swapping launchers.
This is a bit of a dilemma. One the one hand, the JMSDF does not (currently) operate the standard Mk 48 RAM, and some Arleigh Burke class ships in the USN use the SeaRAM instead of the Mk 48 even though they have the Aegis system.
On the other hand, the SeaRAM the JMSDF use are only fitted to their Izumo-class helicopter destroyers, which as far as I'm concerned are surface combatants in name alone. Because of this, there's no baseline for how such a system would be fitted to an actual surface combatant like an Aegis-equipped guided-missile battleship or one of their already existing Aegis destroyers. There's also absolutely nothing stopping them from operating the Mk 48 if they already use the SeaRAM.
I just don't know. Gonna need some more input for this.