So, I've been playing around with the revamped Cathedral, and have some feedback:
1) The combat sensor range of the ship is sufficiently low that the Redeemer (the built-in turret) can hit targets it can't even target lock. I suspect this is because hullmods or pilot skills can boost firing ranges, but not sensor ranges. Maybe consider modifying the "Massive Hull" hullmod so that it also increases in-combat sensor range and not just strategic sensor range?
2) The Redeemer's shots are detonated by fighters. The gun already suffers from a wide number of drawbacks (awful flux efficiency, low refire, and a 0.5 sec delay in firing), and the few times you can accurately line up a target at range... a random fighter can simply wander past and ruin the shot. This issue is kind of unique to the Redeemer since other fixed guns can be paired with normal turrets (with comparable ranges) so at least some shots of a barrage get through. But since no other weapons can match the range of the Redeemer, one stray fighter will nullify all damage at long ranges. I'd recommend giving it some sort of accuracy boost (remove 0.5 sec delay, increase projectile speed, make the shot ignore fighters) to offset this. Otherwise the weapon becomes largely useless against ships with large fighter deployments.
3) The Cathedral's crew usage seems a bit off. At 1500 minimum crew, it's about three times the average for the largest capital ships. But... it doesn't actually seem to use them for anything. Ships with a compatible number of turrets, hangars, or cargo use a fraction of that crew. I think 1500 crew might make sense for its original role as a colony ship, but not as much if it's just a combat ship. I'd consider dropping that number to 1000, or even less... or at the very least, adding a "blast doors" hullmod or some sort of reduced crew casualties effect to the "Massive Hull" hullmod, so hull damage won't suck the entire fleet dry of crew. Or maybe even putting those crew by making it more logistics-oriented; having it grant a fleet repair speed bonus, or maintenance reduction, or giving it more flight decks.