They should not be sold for several reasons. One is they are wore out. All on the list but the Forestall which was the last 600 PSI plant for carriers are 1200 PSI boiler plants 8 boilers per carrier. A leak even the size of a pencil lead can decapitate you. You can't hear or see the leak. The only detection as such is using a broom handle to wave it around in the area you are working in. When these boilers blow they are like bombs. You can't economically replace the boilers themselves as they are the first thing installed in building. They can only be re-tubed so many times.
Second part is IIRC everything below second deck is still classified. What you learn even from The Forestall much of it would apply too nukes as well.
The construction is still so classified that the AMERICA sank a few years ago too obtain data to build the new FORD Class carrier was sank in three miles plus deep water. The coordinates where it was actually sank are secret.