I will do a Better job modeling the trailing edge of the after body. I took your suggestion and modified the rudder configuration to X style.
I saw that in the ship bucket version and like the new tail.
As for the propulsion system, having two large pumps would seem reasonable but is contrary to everything I've read on the subject. Granted that was primarily related to aircraft distributed propulsion. The submarine distributed propulsion stuff I found mostly used 4 pump jets.
I would be very careful adapting aircraft propulsion based on air to naval propulsion based on water. Besides the obvious pressure and density differences you have to remember water does not compress (at least not easily) and water is generally full of a lot more stuff (marine life, suspended particles) than air.
The idea sounds legit to me. Do you have a reference to some documentation to the contrary. I would be happy to read it.
Oh I have done little research on this, just leaning on my naval engineering experiance.
Prime mover aside, what do you think of the readability of submarine based mission modules?
I have serious doubts about its feasibility matched with the requirements of a pressure hull. Granted we have weapons bays that penetrate the hull and are loaded and unloaded (sometimes explosively) but these are usually purpose build enclosures for one thing, mostly don't have pass through access to the rest of use hull (the obvious exception being torpedo tubes) and most importantly do not hold human cargo. I am not sure what the mission modules are for but if it's just UUAVs you could just adapt that to a general use VLS or torpedoe tube for deployment. Perhaps an intel signals package could be useful? I wouldn't want to use a sub for mine hunting...
All and all special ops is probably what those modules would support more often than not and I would think a back mounted module as is used now to be a superior option than dedicating an entire section of every boat to a mission module space most will never use 99% of the time. You could probably put a dedicated wet lock in that spot for half the space and call it a day, use the rest for something else.