stikpusher
I really wanted to add interior details to the cabin
Well, if you do get motivated to do another, you can focus all the interior details on the Pilothouse, as the aft cabins windows were either backed with, or replaced with plywood, on getting into theater. But, you probably ought to open the forward hatch, and would need to build all the detail around that companionway (the hatch was open for ventilation, and as a fighting position).
Also, it's handy to remember that how clean the boats were tended to be proportional to their proximity to Brass. Further, the cleaner the boat, the less-exposed the weapons would be.
As clean as your GB example is, it really ought to have completely-covered weapons. Which would be doubly true for the state-side boats used in training.