This is a replacement for the Akira class that came with the game. This one has a few errors, but is WAY better than the old one. Good job Challenger :)
This is technically a new class for the Federation...but it isn't. To explain, you need to look at the un-used files in the game, which, unfortunately number many. Also, they include quite some
The Sovereign class is the pinnacle of the Federation. It sums it up in just over 700m of sleek cutting and blistering power; she can explore like the Galaxy class, but fight like a Negh'Var