Help with making a new head

[Ordos]

Ok, so I have a skin made for one of the current PC heads (PMHC04) all the darkside skins, and all the portraits needed. At the moment I just have them overriding the current texture. Now, what I want to do is somehow make a copy of the PC head and apply my new texture to that, so that the player doesnt have to overright his current PMHC04 textures/portraits. Ive checked a few of the tutorials in the forums, but they seem really fragmented to me. Im using KOTOR tool and a Hex editor, any help would be appreciated