Custodian: re-assign to Grand Cruiser status. I personally agree with this after repeated play, and the arguments for battleship status are extremely weak.
Stronghold:increase hits to 12. Something this large should not have 10 hits. I really don't see why the cost should go up, it's already 350 points, more then a Retribution and not as good. More then an Oberon as well.
Emmisary: speed increase to 25 cm, remove "warden only" status for grav hooks (as a diplomatic vessel, it should allow for alien allies to be brought in to the fight)
Protector: Remove the 45cm, weaker battery option, make all weapons 45cm standard. cost remains the same.
Castellan: cost reduced to 45.
Dhow: cost reduced to 40 and speed increased to 25.
Warden: This appears to be something that will be the source of some discussion. personally, as this vessel is locked into the Custodian, I feel it should be slightly more powerful for it's points. IF we want another option, it should be just as effective and the same cost as it's alternative.
Suggested stats: armor 4+, WB3, 2 turrets, 30cm speed. (Andrew) Armor +4 WB4, 1 turret, 30cm speed (sig) Armor 5+ WB 4, 1 turret, 25cm speed (me).
Bastion: reduce cost by 20 points.
Citidel: reduce cost by 20 points.