Is it still practical to buy a warship hull and its weapons from different countries?
Short answerYes; modern programmes likewise combine hull construction, propulsion, weapons, and combat systems from different national suppliers.
NotesThe Salamis example combines a German-built hull with American guns for a Greek customer. Modern Australian submarine plans provide a comparison through domestic construction and foreign reactor technology. Weapons, command systems, and other combat equipment may come from still another partner. Multinational procurement is a recurring way to combine industrial strengths.