Thanks!
By project I meant what exists - as different people do different Warhammer nations with some coordination I think I saw. Maybe it's just me.
On Warhammer Undead I see your point. At the same time Necrarch bloodline I think was made as a replacement for old Liches/Necromancers. So at least them would take the same niche. Other lines also have slightly different realations with mortals. Another thing is that in Warhammer Necromancy is restricted to this serie of armies while even those of the others who clearly have access to Death magic (in Dominions sense) do not use zombies, etc. Possibly, it's just impractical, but this is one reason I think about total conversion...
As for Tilea I must note that it has units and characters which are quite the "human norm" as its core. This allows to use much conversion. Coding will necessiate more details, of course, but it's much easier for me than work on new graphics.