Hello!
I have absolutely no idea what to do with NifSkope, but perhaps a more seasoned user could help me out here. I've been looking to skin Jean Grey and Magneto from X-Men: The Last Stand, but there are seriously no meshes that even remotely fit the bill.
Could they be skoped?
Yes, I would look to meshes done by Tommy for jackets and helmets and other meshes for other aspect of the characters.