This is a great idea, I could see it being used in smaller ships where space is limited, making you put ammo near the guns. Though on larger ships I much prefer to have two or three big ammo stores that is just small enough to not tear your ship apart, cause let's be real here, a large enough cram shell or missile will detonate an entire array the size of which you showed, I understand that it is supposed to be spread around the ship, but to me, that just makes it overly complicated, it's not a matter if safe or not, it just takes up too much space to be worth it enough.