You have to try, it is 1 percent more every year until 1940. Plus IC growth, that can be a lot.
I need to look into the AI BBs production. That was reduced some time ago to make the US AI grow its air and land forces faster. They are very expensive and if the AI has a certain percentage of its forces for them, it might be screwed in terms of production. Let's say 2%, then if the AI will loose all its BBs, it will start new builds, that of course then hurt other items. But for the US and the UK maybe an event like for the Yamato series makes sense, so they start building it once, but not a second time.
An event for all should not be a problem.
Iowa, model_4, 01.07.1939, 22.02.1943
New Jersey, model_4, 01.07.1939, 23.05.1943
Missouri, model_4, 12.06.1940, 11.06.1944
Wisconsin, model_4, 12.06.1940, 16.04.1944
Vanguard, model_?, 02.10.1941, 09.08.1946
Did you mean more (laid down, commissioned)?