I played it (before it crashed on to me..

) and I have to agree that this mod rocks..
Fighters do the same business than usual, "corvettes" are more like small-sized capital ships. Frigates are the equivalent of capital ships in Homeworld 2, and the MC80 - Star Destroyer are Homeship-Sized battlecruiser.
And I haven't had the time to build a SSD...
HUGE capital ships, with an incredible range of fire, but can't really move fast.. You have to build regulary fighters for quick intervention, and try to support the HUGE capitals with smaller ones..
All-in-all, one of the best mod I played..