Per
CT: Sup7-Traders & Gunboats, p.16:
... The rear section (13) serves many purposes; on scouts, it carries laboratory and sensor equipment; on couriers, it carries communication equipment and data banks; on detached duty ships, it is cleared out and become a lounge for the crew. ...
Surplus Scouts yes but, not on Scouts still in the IISC employment/leased. There is also a psychological reason for have a Common Area on all ships. It is so the crew doesn't isolate themselves from one another and develop mental issue. If everything you need is in your room why leave right? As pointed out in another thread, there is plenty of space in a 2 by 2, 1.5 meter square room to put everything you ever wanted in one of those rooms.
I know my rooms are off scale to 1.5 Meters Squares. But the depiction of a bed and bathroom is there because, people need to get out of their rooms just to cook their meals. Putting everything into a Stateroom just doesn't cut it in my book unless, you're a Noble or some rich guy.
Second thing, That aft airlock bugs me. I know why it's there (because you need it to exit the ship or space walks.) but why does it sit between the drive and the Jump Drive? Which brings me to my third thing that bugs me. Are you telling me, the Scout is design to fly with thrust off center? Of course, it can be done with or without computer software, but Really?
Depending on the deck plans, I've seen or read descriptions of, the reactor is also in the engine room? Some depict the reactor as being in the 'attic' which I can believe but, you're kinda stretching reality with the dang thing in the engine room that small. People seem to forget, a Fusion Reactor works on the same principal as and Atomic one. Some sort of transfer medium is used to take the heat (Radiation) from the reactor and turn it into power, whether it be through steam or Handwavium. That stuff takes up space.
Which brings me back to being able to move around in an engine room or even a stateroom from that matter. Just cramming everything into one area makes it difficult to work on. All you have to do is look at the engine compartment of a new car. Sometimes, just to change a spark plug, you have to remove all sort thing just to get at them. Traveller Deckplans are allot like those new car engine compartment. As long as they show the floor space as being used by Reactor, Drive or Jump Drive and the occasional workstation everything is fine. But what you're really looking at is a very heavy object with many parts crammed close together, at least in my book.
So to sum this up:
Airlock between engines are a no-no in my book. (some with a grudge could start the engines up while you exit the lock. Bad day for you.)
Making Staterooms a self contain world is bad for your Mental Health.
Flying with engine off center.
Too much stuff crammed into an engine room.