What's the deck penetration on that forward gun? If it's got much of one, it'll interfere with your vehicle deck.
This brings up something that, well, perhaps needs to be brought up.
I've noticed a tendency for some of the newer members on this board, after they have received helpful advice, to ape back that advice in haphazard fashion and perhaps be under the impression that they may know more than they really do.
People like Thiel and erik_t study extensively the types of systems they're dealing with - not just generally, but they know very well the specific stats of various systems, even some obscure ones that might not be known to even other laymen.
My point being, is that there is a big difference between the knowledge base of Thiel or erik_t, and someone who've they've been lending advice to but who doesn't have that knowledge first-hand. Typhoon, as Thiel mentioned, has no deck penetration, it is an on-deck, bolt-on system designed specifically for use that way. He knows this because he's at least somewhat familiar with the system, rather than making a generalized guess based only on very broad knowledge of weapon systems in general.