PMs are the proper way to ask for permission, not by posting a thread in the Releases forum.
So you will need to ask BehindShadows through PM for permission to use the iff files. If he doesn't allow it, you are more than welcome to use the roster from my early version of the mod -
viewtopic.php?f=149&t=88639 - but know that the iff files were converted from behindshadows' 2K12 version of the mod. So to use any of that existing art, you need his permission.