So during my daily scrounge to find something about the constuction kit I found this:

Nesmith, who heads the design department at Bethesda Game Studios, also worked on Skyrim’s systems design. “I did just about all the spells by myself,”
he explained.

I am not sure how factual that statement is but it is intersting that he made it.

Gleaned from this interview: http://www.straight.com/article-585676/vancouver/behind-radiant-storys-glory