If the modder had made a completly new selectable head 2da's and all then you weren't running into the exact same appearance you were running into the original appearance. Also unless an NPC is a custom modded one they use there own body models which have the heads built right in which means you wouldn't have been seeing yourself everywhere unless that modder or another modder had used that appearance reference that your appearance is using for there own custom areas.
The skin was the Darth Maul skin one - Apparently he didn't make it custom he only retextured the Asian Male head:
http://www.lucasforums.com/showthread.php?t=168264)
That's moot though.
Here's my problem now - I can breeze through your tutorial to add a Twilek to the Custom Character screen just fine, but I still have no idea how I would do this for anyone else because so many files are different - say I wanted to make a copy and retexture of this guy's head to add to the character creation screen as a selctable PC
http://img333.imageshack.us/img333/314/popmhc04xv3.jpg) I would have no idea how to find him or his corresponding files and lines based on your tutorial. The tutorial is flawless in telling me how to do it for a Twilek , just no one else. I wanted to jump into doing it last night with my own apperance and then realized I had no idea which lines or other data I would use for that bearded guy.
Thx for any help on this.