This is exactly the same as the normal colony ship, except that it has a max capacity of 1000 colonists.  If you find that you never need to load a colony ship with more than 1000 colonists, you can rename the header and name to be the same as the normal colony ship, put it in your mods\data folder, and it will modify the colony ship definition without modifying coreships.ship.

If you have any questions, e-mail carielf@stardock.com

--CariElf