Since when is the character of the Crusade Era fleet Hull 6?
That's because all new ships(2261 and beyond), which are associated with the Crusade Era, have Hull 6.(Only except the Delphi and the Myrmidon. The first is a scout and the second a "light" Patrol ship.)
So it's not unreasonable to say that Hull 6 is a character of the Crusade Era.
Of course not on every ship, but a Raid Carrier should have it.
But the first Version of the Hephaestus is far too powerful.
I like Ripple's Version more, even though I would drop the Flight Computer.
Only direct combat ships like the Warlock and Marathon are supposed to have it, while support ships like the Chronos and Apollo (and a Raid Carrier) have to live without it.
MfG