A quick question, on the new carrier models i think there are four deck cannons, I was wondering if it is possible to enter and use them, I have gone up and pressed enter with no results.
No. This has been discussed in another thread and they are not usable.
Also CV-6 USS Enterprise did not have those deck mounted single mount 5" gun turrets. As far as I know the twin 5" deck gun turrets were not used til the Essex Class Carriers. The Lexington and I think the other class ship originally had their cruiser class gun turrets but these were later removed.
They are just there for show....
And it's a good thing too. Think how many times the Carrier would've been TK sunk by some bored noob.