Allied shipbuilding does not rescue Germany's economy

Could stronger British shipbuilding soften the crash enough to prevent Hitler's rise?

Probably not, because the stimulus would remain domestic while protectionism still destroyed the export markets on which Germany depended.

Shipbuilding wages would circulate mainly within the countries placing the orders. After the crash, governments also became more protectionist and directed scarce spending toward domestic producers. Germany's export-dependent economy would still lose foreign markets even if Britain and the United States maintained more shipyard employment and internal demand. A milder Allied downturn might alter some international conditions, but the proposed naval stimulus does not remove the central economic pressures behind Germany's political crisis.