Is "BattleCruiser" a relative size? -- discussion

[Growltigger]

Completely random post (kind of) but..... keeping in mind that battlecruisers (certainly in the British navy) were generally meant to be the definitive combination of firepower, armour and speed (and were generally more expensive than battleships)... I always thought that larger vessels in SEIV should be weighted so that they take much much much longer to build than smaller ships and also consume a dissproportionate amount of resources.

Modern fleets tend to have lots of small vessels with a few large battlewagons/carriers whatever. In SEIV, you generally go for the largest hull size you can build, and build as many as your empire will support....

Is there anyway to tweak things so that you are forced to go for a mix of smaller ships and then some big boys?