Well, maybe there can be several "Era" packs.
Like a Terran Vasudan War Project ship pack, an FS1 ship pack, an FS
The Dilgar/Minbari war Era ship pack - containing ships of that era Atremis, Nova starfury, Orestes, Dilgar ships...no First ones, little in the way of Drakh etc
The "2258-2266" era - default as is the core VPs
Crusade era pack --- im working on this...but unless i can find someone to model the ships that arent reskins or TBL/model hacks, i will have to borrow ships from other FS mods...
The nice think is that the variants i found about can be easily made by changing the Weapons, max speed and hitpoints in Fred. I'm assuming that "Special Hitpoint" allows you to fiddle with the HP of a ship with out effecting the hull integrety - correct me if im wrong