I myself am very new to modding, but i doubt you can directly import the ships from one game to another. From what i understand the scale and the values that define it have changed since SPG2.
As a noob, the only way I see, is to manually add new ships and import the old models somehow (way beyond my skills I'm afraid, but if you're any good using blender or 3DS max or so...) and add the values by hand. There's a tutorial on http://www.moddb.com/games/starpoint-gemini-warlords/tutorials for making new ships and mods in general.

Thank you, comrade