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.