I actually gave some thought to this question a while back. I would probably start from the version used in The Cage and then apply the same kind of "similar from a distance but more detailed and refined close up" approach that I have used on the exterior.
Excellent. I'd love to see some sketches if anything else. You really should post more of your sketchwork anyway. From what little I've seen over the years, I find it to be as equally impressive as say, oh, this work.