Mayhem as a skirmish game? I think it would work pretty well.
Looks like you had a great game. I especially love it when a summoning spell goes wrong like that. It makes for a great story and is always a good time.
I especially like what you did with the leader/leadership rules. I think a version of those changes just may find a way into the skirmish version [
if one is being worked on of course].
I'll make sure to give credit for the inspiration.