Blender gets rid of the texture effect, IIRC.
In the 'battleship.nif' if its anything like 'bomber.nif' or 'fighter.nif' (and the default is glossy in game IIRC) you should find underneath the main node where the battleship's body is located a "nitextureeffect" with environment_gray metal_fx.dds or something underneath it. Then you make a gloss map by bringing the saturation all hte way down while increasing contrast and lowering brightness (depends on how much gloss you want). Then add that as a gloss map and you should be good to go, check it out in game because things aren't as they appear in sceneviewer...