I was contemplating running Witchfire Trilogy under Runequest. Now I am thinking of doing it in Runequest Modern, but I've had lots of ideas for the original setting.
You might want to make sure that the PCs have a high Dodge score. In preparing character creation materials, I decided to give all the PCs +70% in Dodge.
I'll see if I can get what I generated onto the Runequest Wiki this week.
Converting IK to a classless system led me to conclude that all sorts of interesting characters would exist that are not in the D&D version, including Menite shamans and Cyrissian druids.