Unfortunately, there isn't room for a life support system in that section of the Enterprise
. This section was built like an airship hangar, with the control room positioned at the rear.
Personally, I think this Enterprise
's secondary hull is a scary, mess with a weapon bay bifurcated by main engineering. Understanding this, I can understand Scotty's hesitation in having new torpedoes loaded onto his ship. I don't know of any ships where weapons were located in the vicinity of main engineering. There always seemed to be a separation between them greater than a wall.
(I am still conceptualizing how a cargo conveyor would work in a starship. [Star Trek Ongoing, Issue 19])