"- Tall bulkheads (i.e. not rounded openings)
- Doors that go to the floor (i.e. not rounded openings at the bottom)"
I'd argue that point. On a world cruiser, especially one that size, having watertight bulkheads could save your lives. There's been quite a lot of talk among the global races over the past decade, all trending to requiring multiple watertight bulkheads because collisions (whales, cargo cubes, buoys, boats) do happen, and closing a bulkhead on a boat that size can be the option that saves the boat. Not to mention, the crew.
Of course, bulkheads will mean no doors to the floors.
Sounds like you want one of Steve Dashew's boats. If he still makes anything under a million, he might also know when one comes back on the market as the owners move up.