actually, the mod 2 was never installed on any ship in real life. the kidd, tico and virginia all had one mod 0 and one mod 1 IIRC, together they had an missile capacity of 68 missiles.
I have doubts about these fitting on your hull. the beam will be required to be the same as that of the spruance class, making this ship quite a bit fatter then she looks right now.
for the mod 2, the plenum vents and reloading hatch for the forward launcher are actually underneath the forward superstructure........ you could fix this by moving it a bit forward but even then, it still is quite cramped. at the aft mounting it seems to fit, but still it looks somewhat cramped. due to the forces involved in this system, I would suggest fitting it on the strength deck, which is one deck lower then you have it now. however, if you place the launchers lower they penetrate too deep in the hull so the only way you can do this is to increase freeboard with one deck.
btw, you still have the plenum vent for the Mk 13 fittet aft
my very last remark is that the Mk 26 is an very modern system (first fitted in 1976) while your destroyer has the looks of being build about 10 years earlier.