[Sombre]

Regarding the beasts - there's plenty of room for a Beasts of Chaos nation based on the Warhammer army list of the same name and the earlier Beastmen army books.

Feral Harpy
Ungor
Gor
Bestigor
Beast Chariot
Minotaur
Dragon Ogre
Chaos Troll
Chaos Centaur

etc etc. Sort of like a Chaos version of Pangaea. Lots of blood, death and nature magic, along with some stuff from the 4 powers.

But the Hordes of Chaos should get Chaos Warhounds I think, since they are associated with marauders, not beastmen.

I like the stats on the marauders - a basic att value of 12 seems right for Chaos, who are supposed to be the undisputed masters of melee. I think I'd give the marauders another 1 or 2 hp though, they only have toughness 3, but their large northern frame could account for an extra point or so. Skaven have toughness 3 and str 3 as well, but are clearly smaller and weaker - in dom3 you get more values than in Warhammer, so you can represent these differences - I gave them str 9 and hp 9.

As for the chaos warriors - WS5 is very rare and very high in Warhammer (amongst basic troops) and I would give them at least 14 att. By the time they become chaos warriors they are starting to become more than human, so they don't need to be limited by the general Dom3 stats of elite troops having att13 or so.