It seems the biggest / last class a ship can be is a Collossal Galaxy Destroyer.
Will it go further?

Galaxy Carrier Class


You will now have a set number of drone fighters per your level, that will add to your
defense, and you will have to maintain. Research and outfitting still apply.

or

You will now have to recruit and outfit small fighters, that will add to your
defense, and you will have to maintain. Research and outfitting still apply.
Pilots will be a set number per your level that you will be able to train under a pilot
tech tree.

neato

I like that one, altho the Collossal Galaxy Destroyer probly should stay the biggest (i mean come on, it destroys Galaxies) but i think it would be cool at a certain point that you could choose to go down a branch of different carrier types. So you could either keep going down your path to the Galaxy Destroyer or go down a path that would lead up to the Galaxy Carrier Class (which when it comes to ranking up in size these ships will rank up at the same deck sizes)

+1 way cool idea!!

allows for players to now also branch into different trades so to speak, not everyone HAS to become the owner of a huge ship, they could opt to become a super starfighter pilot, ship size way smaller but can research better weapons etc....