it might be easier to use a (newly extracted) Skyrim Steelsword.nif as template, and select the NiTriShapeData and import your OBJ file.
Yeah I did that.
Still says "link points to wrong block type".
I did everything in this tutorial: http://www.youtube.com/watch?v=KVPicWtxTWk
And Nifskope tells me "link points to wrong block type" when I save, and highlights "BSLighting..."
I exported from Maya as a .obj and imported it into Nifscope, then followed the tutorial.
I can see my sword in game but it has no texture or lighting, just an enviroment map.