How closely does the game model historical warship cost?

Is the game's ship-cost model historically accurate?

It gives a reasonable rough indication, but historical designs such as the Queen Elizabeth class do not reproduce their real costs precisely.

The cost system is a rough guide rather than a historically exact accounting model. Attempts to reproduce ships such as the Queen Elizabeth class do not align precisely with their historical cost. Even so, the estimates are good enough to indicate the broad financial consequences of changing a design. That limitation matters whenever game-based design exercises are used to reason about real procurement choices.