Could a large cruiser hull from the 1930s still serve today as a military testbed?
Short answerYes, if modernized; a large cruiser-sized hull could carry new systems such as VLS even after losing front-line relevance.
NotesA sufficiently large 1930s cruiser hull could still perform useful work if it had been preserved. It would require modernization, including systems such as VLS, but a roughly 10,000-ton platform offers enough volume to serve as a test ship rather than a first-line combatant. Displacement and internal capacity can extend a hull's experimental value long after its original weapons are obsolete.