Not what you may think.
Has anyone decided to use the Darkmaiden's Dance maps (Dungeon #139) instead of the Sea Wyvern maps?
It looks to me that DD is better designed than the SW, a bit wider in the beam but less one deck in the hold. I guess that could be designed around as well by adding the SW lowest deck to the DD.
Cheers!
For me, Darkmaiden's Dance became the Blue Nixie.