I spent a little bit of time designing a Federation guided missile cruiser. The ship that was used in the games has been re-classified as a guided missile destroyer. Its designation is DDG150 The 150 designation is the size of its power plant.
The two designs for the guided missile cruiser are CG300 and CG330. The maximum size of a fusion power plant in the rules is 300MW. However, the battleship in the game that is being used for the Panthari Imperium has a 415MW power plant. Therefore I created a 330MW power plant to provide full power for the 300MW drive (the largest in the game), sensors, and laser weapons.
While investigating the various 2300AD websites I was able to find an excel spreadsheet for designing ships. After putting all the components into the spreadsheet, it provides all the game statistics for the ship. Using the design spreadsheet also allows you to verify that the ship has the correct volume for the design.
The two cruiser variations have a pair of 24 meter external diameter, 21 meter internal diameter counter-rotating hamster cages/spun outer hulls that are 12 meters wide. There is no artificial gravity in the game so various types of spun habitats are needed for crew health and comfort. In combat the spun habitats are stopped and locked in place. Some ship designs in the rules including the DDG150 have habitats that are on pylons that are rotated around the main hull as can be seen in the view of the DDG150 below.
The forward 12 meters of the CG's house eighteen missile bays, the bridge, the tactical operation center, life support, medical bay, and sensor equipment. The rear of the hull houses the other eighteen missile bays and drive along with part of the fusion plant. Due to upgrading the missiles, each missile bay occupies 100 cubic meters instead of the original 70 cubic meters in the rules. The fusion plant is rather large and occupies over 50% of the internal hull space extending from the rear of the ship to just past the rotating habitats. This also includes the various engineering work stations for the power plant. The image below shows the two versions of the guided missile cruiser.
CG330 CG300 DDG150
Diameter 24m 24m 21m (main hull only)
Length 54m 50m 70m
Mass 20,576 tons 18,455 tons 7,213 tons
Power Plant 330MW 300MW 150MW
Move Distance 9 9 9
Armor 9 3 1
Radiated Signature 5(8) 4(7) 4(7)
Reflected Signature 6/7 6/7 5/7
Target profile 0/1 0/1 0/2
Active Sensor 2x15 2x15 1x15
Passive Sensor 2x10 2x10 1x10
Laser Turrets 24 24 10
Missile Bays 36 36 4
Crew 177 174 100
Cost 506.27mc 462.87mc 154.12mc
The cruisers also carry four sensor drones compared to the two for the destroyer. While their cost is about three times that of the destroyer, their missile salvo is nine times more powerful. The armor of the CG330 can be penetrated, but with difficulty. It costs almost as much as a Panthari battleship, but can out run it and has much better armor. The CG300 costs about the same as a Domain battle cruiser, has half the armor, but is faster and can launch nine times as many missiles. The CG330 is more expensive, but is better armored than the Domain BC.