What stopped German naval architects from using Italian-derived triple 15-inch turrets for Bismarck?
Short answerPrimarily German institutional pride, not a technical barrier to studying or adopting Italian work.
NotesGermany could have sent naval architects to study Italian capital-ship practice. Mussolini's regime might even have welcomed the opportunity to display Italian achievement. German institutional ego, rather than a technical or diplomatic prohibition, was the main obstacle. Cross-national design learning was possible, but it required the receiving service to admit that another navy had a useful solution.