Intrepid or defiant in single player

You must chose your ship, and whichever you pick to install will be what you start with. Once you get to the point where you get the soverign, the game will continue as normal with the soverign. The will make the galaxy class completley unavailable too, so you should keep a backup of your BC directory.
This give you the choice of using either 9 of 9's defiant or p81's intrepid in single player missions. I say choice because it's not made for both at the same time. It's like 2 mods in one package.