These plans just keep getting better with each refinement. The "Changeling" mad rush corridor is now very clear to see. Are there going to be examples of similiar staircases elsewhere in your plans? It would be odd if there were only one, although the central "doughnut" is certainly a good location for them.
How tall is Deck 9? You seem to have put the entire height of the Engine Room in there without it interfereing in Deck 8 above.
Finally, I DO like the moveable partition wall in Engineering - it covers so many changes in the number and positioning of the energizers. I vaguely imagined them popping in and out of the floor, but your (considerably) simpler solution works a lot better!