In short, this mod page includes;Over a hundred new skins, almost all with bots of varying characteristics. Proper Weapon HD Retexture, Crosshair "improvements". Over 20 new maps of varying(amateurish) quality and theme. And some optional game-altering modifications(with each having different themes/"flavors" to choose from).
For anyone who caught where I'm going with the overall design; Yeah, I'm a BIG fan of Quake II's RG, it's my most favorite railgun design across the whole Quake series. So now, Quake 3 RG looks more beefy.