Compare it to any other mod which does one of the following:
A. Is a TC mod that places the entirety of another game into FreeSpace.
To name several, The Babylon Project, Wing Commander Saga, Diaspora (Battlestar Galactica), Shadows of Lylat (Starfox), Stellar Assault, Fate of the Galaxy (Star Wars), Journey to Hiigara (Homeworld), The Apocalypse Project (Homeworld 2), FringeSpace (Tachyon: The Fringe).
B. Adds to the FreeSpace universe either as a Prologue to FreeSpace 1 or an Epilogue of FreeSpace 2, or in between timelines.
Do I really need to go there with listing them? Inferno and Inferno Alliance, Blue Planet, Ancient-Shivan War, Terran-Vasudan War, The Unification Wars, Alcibiades' Gamble, Derelict, Homesick, really there's too many.
And then there's Wings of Dawn which did neither and made a universe from the ground up. That alone gives it a higher degree of originality than anything I just listed.