One should recall that I was using the original set plans (with the 10 foot ceilings
), Jefferies' original deck layouts, and had room for more than 290 cabins in the primary hull alone. No need for 9 or 12 people to a room there... I was considering a small amount of the crew doubling up but there is also a ton of room left in the secondary hull for more cabins.
As for the dorsal, the true strength of it would comes from geometry rather than bunk material. The amount of room for use can be seen in my sketches here
In my opinion Jefferies did a good job and few if any compromises are needed to make everything work. But to each their own... if you want something different, do it your way. But it works as Jefferies laid it out just fine.