Tracy White should be along to opine soon.
However, "US Navy" plans/drawings are not a single, unified thing.
There were USN-issued "modeler's drawing sets" which were simplified to show only the sorts of things a person could model back in those days. These drawing sets were also economical for being the needful stuff, no plans to the after steering flat, or the like.
There are also some official blueprint plans for some USN ships. These are not always "as built" (or "as re-built"), but, they are 'official.'
Let us look at an example. Not quite 200 were built, in two superstructure types, to 3 or 4 sub forms (depending upon whether or not one wants to call the slab-sided funnels a specific type). Each of these ships were fitted and refitted, and the fit-out changed several times just during WWII. The ships were then modified again (sometimes) during KW; and some again in the 60s & 70s.
That makes finding an 'official' plan for a given ship a bit of an exercise.
The hulls of the Iowa-class battleships are another good example.
The midship section of the Iowas do approximate a square-sided hull with almost no rise to the floors. Now, the floor (the bottom part of the "U" of a hull frame does have some rise, it's very small in smaller scales. A model kit manufacturer needing hull volume for batteries for a motorized kit might be forgiven for "flattening the flat." At least for an Iowa.