i think i might know them as well.
Well you can start here with this
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its a little too updated though. The scripts we use are for blender 2.49 which is very old. The interface is also pretty terrible as well. The plugins need updating. They are here anyway. Make sure you grab the latest one though.
http://forum.ragezone.com/f694/ski-blender-importer-508133/
i would suggest downloading maya and mudbox instead then just exporting the models to blender, connect the textures then save out as a ski. When exporting you just need to make sure to add all the properties in correctly and it will work.
If you need help with using maya or mudbox i could probably help out a bit.
Then there is a the gfx effects, i only played with them briefly though so i wont be too much help with them. Its pretty much just changing random things in notepad and seeing what happens.