If you work at a submarine drydock (EBD?) I'm not sure we could add much to what you already know about them.
Have you thought about a floating drydock? I saw some photos of an Iowa BB in a floater once. The battlewagon didn't quite fit and the forward swinging catwalks didn't close completely. I always wanted to do that in 1/350. If I ever move into and abandoned supermarket to live..