Hull Class Names Such as Cruiser, Battle Cruiser, Frigate, Light Cruiser. Not the Class Name Like Prince of Wells, Ajax, Apache, Argentina and such like that
In early game, I usually go with this list:
< 1000 tons are fighters, bombers, FACs and pinnaces
1000-3000 tons are corvettes
3000-5000 tons are frigates and destroyers
5000-8000 tons are various cruisers
8000-10,000 tons are battleships
then after a while this gets upgraded to:
~5000 corvettes
~8000 FF/DD
~12,000 cruisers
~20,000 BB-CV-DN
As said, it is entirely up to the player how they wish to classify their hull sizes. Since a single shipyard can produce multiple classes if these are fairly similar, I tend to keep these kind of rough sizes for classes, so a shipyard tooled to produce a destroyer can, for example, also build frigates. Plus, I go with a mixture of smaller shipyards with multiple slipways and large shipyards with 1-2 slipways. Trying to maximize both shipyard size and the number of slipways gets pretty expensive pretty fast, both in money and resources but also in time required.