That's one of the problems with museum ships. In a way, they are 1:1 models of working ships, and are often stand-off scale - even without the hatches and doors cut into them for the convenience of visitors.
Case in point: My father headed the crew that converted the mothballed USS North Carolina into a museum ship, 1961 - 1963. Because the ship had already been decommissioned for 13 years, with no plans to keep it in a ready reserve state, much of the equipment she carried in WWII had been shipped. What my dad's conversion crew produced for the 1962 dedication ceremony was what could be honestly described as an "attractive hulk." It was not restored to any particular historical configuration, so it's very difficult to use the ship as a basis for building a scale model. Every piece of equipment, weapon and structure has to be studied carefully, and compared with photos and drawings of the particular configuration a modeler is building.
That is not to say that a museum ship isn't valuable, from a model builder's perspective, but one has to pick and choose the areas of interest. For example, there are only 9 OS2U Kingfishers left in the world, and one of them is sitting on the stern of the North Carolina. Of course, it's out-of-place, sitting on the deck, because the catapults are long-gone.
