I have some doubts about an twin gun fitting in that unit, though
and I also doubt the forward 2 VLS cells would be different in position, for construction reasons, unless you can show me an real world ship with an arrangement like that? (note, for 2 blocks a bit apart from each other it makes sense, but as close as this I doubt it)
i should have enough space to space a bit more the fore VLS cells, Sejong the Great has indeed two vls block near to each other (aft, near the hangar) but you indeed are right as they are not that close.
i also admit that a twin mount built using the frame of the Oto 127mm is a bit forced, the only explanation i had is that on one of his personal design CGs Erik_t draw a twin 5-inch gun that had roughly the same dimensions of the Oto-compact, and beign (despite it's denomination) the largest gun mount fitted on modern warships i tought it might have done the job...
I might rotate the mid-ships VLS block or otherwise adjust it so that it interferes with the hanger spaces less.
Technically the aft superstructure with the 32-cell VLS block, helo hangar and everything else is lifted there without modifications from the Atago class DDG, wich has a beam of 21 meters versus the 22 of my drawing.