I think the fighter(top-middle) is from Starfleet Command Volume Two: Empires at War
I have that game, but I don't recognise the fighter. The fighters are
very small though, and I haven't played the game in a while, so that might be the reason why.
I had no idea that Starfleet had fighter-craft....
As far as I know, they don't. Games similar to SFC give the Federation fighter-craft because it makes the game more fun, or adds strategy.
The closest thing to a Federation fighter that I know of would be the shuttle that Data flew in Insurrection. You could even say that the ship that housed the Argo dune-buggy thing was a fighter, but we never saw it in action.
There was also the Romulan Scorpion in Nemesis, so you have to assume that the Federation would have
some sort of fighter craft. The Federation would never knowingly leave such a gaping hole in their fleets and tactics...
the Greed shuttle (very appropriate name...

)
Yeah, it is!
...
Right then,if you want ideas for the designations of the ships, I can help there.
The D'kora was a Marauder in BOTF. It had relatively powerful Torpedoes but relatively weak beam weapons - but enough of them to make up for that weakness. It would really make more sense to make it a truly uber Privateer for you mod, and this would fit in well to their money-grabbing philosophy. It was their BOTF equivalent of a Battleship though and their largest class of ship, so you could also make it a Battleship.
The Glantor was a Troop Transport in BOTF. It was completely unarmed, and they always left battle by the quickest escape route in BOTF. It would make sense for it to be the equivalent of a seige unit in your mod. You could then use it to capture enemy systems/cities or to make it easier for
other units to capture the systems/cities.
The Goront was a War Cruiser in BOTF, which was the equivalent of a Command Cruiser. They had powerful weapons, and were relatively fast ships, but they were weak on defense. It could be a
very powerful Destroyer or even an AEGIS Cruiser in the mod.
The Ngort was a Light Raider in BOTF. They had weak weaponry but they made up for it with sheer speed and relatively good defense. It could take the place of a Privateer or a Frigate in your mod.
The Greed shuttle could be a
small Transport or a trade unit.