I wouldnt be too concerned about the low exhaust ports, im sure they have some sort of "Non return valve" integral to them......at least I hope they do. Once again however this whole program seems to have suffered teh curse of continual "Requirements Creep" meaning the design team are totally reactionary to a continuously evolving set of requirements and the desire to integrate the newest emerging technologies.
I think that the Littoral Combat Ship concept is good and is a very needed capability. But is this vessel whats needed? Not so sure. Was any consideration given to a licence build of Visby Class? The Swedes know littoral combat ops inside out. Its what they do!!!! Now I know the Visby is a significantly smaller vessel at just under 700 tonnes displacement, but they sure do pack a lot of capabilities into that small hull.
Here is a nice Visby Vid, not quite sure about teh music though