It seems to me that the Besch material atleast works, but the wood one doesn't. What I dont understand is though, you said you couldn't see the textures in the fbx import window but in your screenshot in the skin settings there are ~21 skins?! Have you added those manually? Instead of adding skins, have you tried replacing the wood one in Med (skinsettings -> 'click the original wood texture' -> skinsettings -> texture file -> ...) to see if that works? And just to be sure, select the wooden parts of the model and than select the wooden texture in the skin editor and do 'set skin'.