With only two s-mods, Reinforced Bulkhead is a cost on Ziggurat. I could squeeze it in, but I cannot get everything, unless maybe with Special Modifications, but I do not have that if I have Automated Ships.
But Ziggurat is not the only ship I had in mind in Reinforced Bulkheads. I meant EVERY ship I pilot (and those that do not have officers). Very noticeable if I chain Dooms, Harbingers, and Afflictors but lose some. Sometimes, if I use Conquest or Paragon, then crash and burn it, and I want to swap to another ship instead of wait several minutes for the rest of my fleet to finish the fight.