@Adela - Where did you find the human male nude body mesh at? I have all the textures dumped, and I do not see a unique texture for Cullen's body texture. I have to agree with Kiitosu that he uses a different tint than the default human male, but I want to test again to make sure.
Its also possible its related to how tints work in the frostbite engine, and we could still be missing some kind of key data for this.
Also from what I could tell using m-ray to say blinn for texture base, the only thing I noticed was the textures seemed more rigid.
Found the body, it was in itemappearances_00 as well. It has Cullen's tint map there with it lol.
Now to find the skeleton..hmm.