What is the unit of count in the length of data field - bytes I assume?

And I really have no idea what you mean by statements like "Count of something. Multiply this number by 28 and add the result to every offset beyond this field (including the next two)."

However, I do like the idea about changing the face and voice of my Lich! This did occur to me, and I was going to ask whether it was possible.

But I don't know, maybe this time I'll stick with the vanilla game, just to be on the safe side. I might do the mage quest instead. I'm not so sure the lich has anything essential anyhow, the "souldrinking" spell sounds very useful but apart from that I haven't seen too many dark magic spells that are anything to get excited about.