here's an idea that might work.
when I saw Shaw
's illustration it reminded me of a diagram that was mounted on the main engine control board on the ship I served on in the Navy. The ship, USS MARS, had a large engine room amidships with a single shaft running aft through a narrow series of rooms (shaft alley) to the screw. That ER and shaft alley were represented on the diagram.
only i figured two engines, two shaft alleys.