As a complete novice on this I need to say this: it SOUNDS a lot like midgard/vanheim etc nations.. with other heroes...
are you all sure it's worth a mod..
well it's your time.. but couldn't you just make the rest of the warhammer nations first? (this is of course totally not influenced by any personal desires I have

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Want a blend of
fantasy and
sci-fi? Try the total conversion
Dominions 3000 mod with a new and fully modded solar system map.
Dragons wanted? Try the
Dragons, Magic Incarnate nation.
New and different undead nation? Try
Souls of Shiar. Including new powerfull holy magic.
In for a whole new sort of game? Then try my scenario map
Gang Wars.