No Dreadnoughts should ever be built in the game since it takes 3+ years from start to finish. I understand it makes the game unplayable, but accuracy and not fun must be part of the game.
Extrapolating this further all other naval units take 6-8 turns to build. I understand this means that half the game will have empty oceans, but oh well. Accuracy and not fun is whats important.
Limits on how many of one type of unit get built would also presumably be part of Larry’s rules.
If one thing we know is Axis and Allies is a perfect representation of Historical accuracy, and not fun anymore.
Enjoy the game.