Confederation Navy: Battlecruisers
There are two cases for battlecruisers, one for peacetime, and one for wartime.
Historically, battlecruisers are more expensive than battleships, with arms treaty limitations and the event of the fast battleship, speed was near enough so that they could be discarded in favour of using available resources to bolster the line of battle.
The Confederation Navy would have been keenly aware of their own Terran naval history, which is why they discarded the concept the moment they had achieved technological level fourteen, and started manufacturing fast dreadnoughts.
Battlecruisers mount weaponry that can overpower a
cruiser and seriously threaten a capital ship but are
lightly protected. Most battlecruisers serve in a strike
or rapid-reaction role and designed to be capable of
chasing down raiders or conducting an effective raiding
voyage without an escort.
And yet here we are.
In theory, you cut expenses by placing the line of battle ships in ordinary during peacetime, but:
1. Maintenance rules favour keeping as many starwarships in service as long as possible
2. And going by current events, the line of battleships are used simultaneously as training ships, to create as large as possible a pool of well trained reserve sailors
3. The Confederation Navy is likely in a constant state of readiness, to counter Aslan volkerwanderung, and liberate the Occupied Territories, when the opportunity strikes
You can probably carve out a niche for the battlecruiser, if it's a larger Azhanti, fast enough to catch up to commerce raiders, and powerful enough to destroy them, sacrificing armour for an extra twelve and a half percent jump fuel and engineering.
Drawing from the description, I don't think it would be a Splendid Cat, nor a Kongo, but closer to the original Fisher dreadnought armoured cruiser.
It also means that the Confederation Navy stops manufacturing cruisers of between fifty to a hundred kilotonnes, because you're not going to need both.
Cruiser killers only need to mission kill their prey to be effective, and could getaway with a calibre just below what's considered capital, but above by what were then treaty limitations, basically super cruisers to take over the niche occupied previously by battle cruisers.
I rather doubt that the Confederation Navy bothered to retain either the Zeus or Victory classes, assuming any example survived.
It's likely Confederation battlecruisers of technological level fourteen, or fifteen, would be between one hundred fifty to two hundred kilotonnes, with a strategic range of five parsecs, acceleration factor seven, so that they can dictate the range. Primary armament would be as large as possible spinal mount that can fit the leftover volume.
During peacetime, likely used as presence and rapid response units; during wartime, maybe reconnaissance in force, certainly tracking down commerce raiding, and maybe in the early phase, conducting commerce raiding and strategic strikes on their own.