well, if you "reskinned" something, you'll take the dds files out of the materials zip in the nwn2 data folder, then you'll take the mdb file out of the models zip, you'll use an mdb cloner to associate that mdb with the two skins (one for the diffuse, one for the tint), and then drop your new mdb into your override to see what it looks like.
if you want you can send me your dds textures and i'll put them on a model for you and check it out.