I'll try them out.
The L24 does have that "You seriously need to consider running away" look about it.
I might add a few external Drone Racks as it does have enough hull to carry a lot of these. That would make it an L24D then.
As a carrier, the L24 would make the perfect hull for conversion with maybe transverse or diagonal launch tubes and landing bays. It would be able to carry more than double the fighters of a C8V or a N6 with twin CVA pods.
We run the L9 as a destroyer rather than a heavy frigate. It is better suited to this role than the up gunned F5 DW* lash ups.
The D18 Laratan works out well as a Heavy Destroyer.
The FASA ships do fill in the gaping holes in the SFB Klingon Fleet regarding destroyers.
Actually, as with Earth Naval ships, the size of the vessel's hull doesn't determine its role, it is how it is armoured / shielded, equiped out, mission profile, crew training and armament that makes a ship a frigate, destroyer, light cruiser, medium cruiser, heavy cruiser, dreadnaught or battleship.
Technically, during the 20th century, a destroyer was defined as a frigate armed with torpedoes and light cruiser armament. Technically an L9E is a destroyer.
Cruisers were so classed as they carried torpedoes with the armament / armour balance determining the size type.
Corvettes were defined as small warships, constructed in merchant shipyards, that carried no armour and had token heavy armament, being armed primarily for point defence and equiped heavily with EW kit.
The most numerous ship class built in WW2 was the Flower Class corvette, which numbered hundreds.
The general heiracrhy, lowest to highest, for warships and combat able craft in the RN and other navies is:
Motor Gun Boat
Motor Torpedo Boat / Patrol Torpedo Boat
Skiff
Gun Boat
Corvette
Minesweeper
Frigate
Heavy Frigate
Destroyer
Heavy Destroyer
Light Cruiser
Medium Cruiser
Cruiser
Heavy Cruiser
Monitor
Dreadnaught
Battleship