Could a treaty signatory send plans and parts for a capital ship assembled by a non-signatory?
Short answerPossibly as a gray-area transaction, especially with distributed suppliers, but a complete package from one signatory would be hard to conceal or defend.
NotesThe treaty reporting rules focused on ships a signatory built, creating ambiguity when another state assembled the hull. Engines and ordinary components could pass through commercial channels with limited attention. Guns, turrets, and armor are much larger and more visible transactions. Spreading purchases among several countries might preserve legal distance, while one signatory supplying the entire capital ship would invite challenge.