I was planning on doing this very thing, actually.
I like Warcry quite a bit so far, and also love Mordheim. I'm torn on it, so thought I'd go on the idea of trying to make it so that my friends and I can use our old Mordheim models in Warcry, then move on to the other side where we can play Mordheim with new, modern Warcry rules.
Since the sudden spoils of all the extra factions, it's been a bit easier to make the warbands up. I went ahead and attached a pdf of the one that's gotten to the point of being testable. Let me know what you guys think?
Skaven - Clan Eshin v0.1.pdf