Shipbucket

I do there are the dark green boxes.

I will explain the twin turret later.

When you increase something as major as the hull, EVERY system of the vital to its operation (not the guns or weapons) sub must be increased in size proportionate to the change. Those dive-planes are puny and will only slow the ship down, rather than change its direction. And, adding aft torpedo tubes would just strain the amount of space needed to run the propulsion systems. Plus, you still haven't changed the props and rudder.

_________________
Worklist:
Puerto Oeste - AU - WWI-WWII

Your tube doors don't need to be that huge to be fair either. Again echoing others the turreted gun is a saft idea.

_________________
AU Projects: | Banbha et al. | New England: The Divided States
Blood and Fire

Re the twin 4.5-in d.p.(if that is what I'm seeing); no way on a submarine; they were not designed to be water tight when submersed. No offence, but its just no use bunging odd bits onto designs and then asking help to make them work.

What can I have instead of that turret?

A deck mounted gun on it's own like 99% of other submarines with a gun have.

_________________
AU Projects: | Banbha et al. | New England: The Divided States
Blood and Fire

How about now?

Loose the gunshield.

_________________
AU Projects: | Banbha et al. | New England: The Divided States
Blood and Fire

How I don't know what the gun looks like underneath.

Then substitute it for another model or research what it looks like. Stop pasting bits and pieces and actually think for a second about what you're pasting.

_________________
AU Projects: | Banbha et al. | New England: The Divided States
Blood and Fire