I should check this, but it might be that you have misdrawn some openings in the hull. the openings just in front of the funnels, 2 above each other, are IIRC the air intakes for the gas turbines. seeing that one of them has a door in it, and the forward and aft sets are different, mean that one of us has them interpreted incorrectly
also, I am not certain I like the sea dart launcher with the (oversized drawn) missile on it, and at the very least the missile should be a few pixels higher, meaning that the guide rail connects to the missile body and not to the fins.
edit: refs that claim the above (note, I do not entirely thrust them, because the top and side views do not match up, but in general arrangement they seem to be correct)