As far as writing, I only have a pdf of the park credits when it won the TEA award. It appears to be a very incomplete list as none of the people I mentioned above are included. The credited showwriters for TDS are Scott Hennesy, Bill Cyr, Jan O'Connor, Michael Sprout and Art Verity... one of them may have worked on the Fortress.
I know that in the early years of its development it was called Tokyo Disney Seas (plural), and I've seen some veteran WDI still refer to it as that. Tower of Terror shared a couple easter egg links with Lost River Delta, but I don't know about S.E.A. & the fortress.