There are certainly ways to build the modules so access to the turrets is through them. I’d have been happiest with no dedicated hallways as they’re wasted space. Like storage lockers, CIG just does not put adequate concern into volumetric usage. It’s often deliberate. They don’t want grav plates in Vanguards because if the Vanguards had even 8 SCU space, no one would buy the Cutty.
I don’t think there was real reasoning behind the twin hallways in the Tally nor the HH. As I’ve noted before, the center of mass of the ship should also have the highest mass density. That makes all the rotational moments smaller and rotation faster. Making the center of the ship empty is about the worst choice one has so far as maneuverability is concerned. It also makes getting around the ship a chore.
Some stuff you know they won’t fix. I get it. Think though, what else you could do with all the deck space of that hallway. It’s a lot. Aegis was my favorite manufacturer for years, but no more. I’ve traveled thousands of miles in a motor home. I know what well designed vehicle space looks like.
You have to get to the waist turrets, because you just got snared, or you have to leave the waist turret to help with damage control. How do you get through the size 9 torpedo?
The Tali is a bomber specifically designed to carry size 9 torps, which are carried along the center line and have significant mass. The components are evenly distributed on each side so cancel each other out for angular acceleration. The only imbalance is if you fire an odd number of torps, so, for physics, you keep them close to the centerline.
The other modules are aftermarket and aren't part of the original architecture of the ship.
The only extra space "freed up" are the module walls. I'm pretty sure the walls are needed to transport the modules without the ship.
You still have to be able to traverse the area and get to both the stations and the Components. See the Freelancer and the C/M2 Hercules as the two most obvious examples. They don't even have components or stations in the cargo bay, and you don't need the ramp(s) to enter or exit but they have hallways when fully loaded, there just isn't a wall on the inboard side.