The obstacle to adding upgrades like armour is the chance of people exploiting the /restart to make money. It's depressing to think that people would just sit there starting and deleting characters, but you know how some people think.
Adding a better powercore to the Crusader might be workable. I don't think we need to worry about people flying around in uber Crusaders.
As it is now, the Dragon has a level 5 shield mounted, even though it could mount a level 6. Rather than messing with armour, I could have the Dragons mount a level 4 shield.
My original idea was for Liberty/Rheinland but as Mjolnir indicated the vanilla ships are on a ladder.