Thanks Messiah!
Hmmn.. Not what I had in mind though... I'm thinking on basing them on the normal Dwarf Warband. With a count as explanation.
The only hith could be the Bull Centaur. (or as I prefer Boar Centaur from the ye olde days!) I think the best way to solve that is making him a mounted Mercenary Knight.
These would be the following other troop choices. (yes, I already gave it some thought!

)
Note: I kinda based my ideas on the pre-Hat era Chaos Dwarfs.
Chaos Dwarf Noble/Priest - Dwarf Noble.
Chaos Dwarf Engineer - Dwarf Engineer.
Chaos Dwarf Berserkers/Mutants - Dwarf Troll Slayers.
Choas Dwarf Warriors - Dwarf Clansmen.
Chaos Dwarf Blunderbuss - Dwarf Thunderers.
Choas Dwarf Initiaves (don't really exist I know) - Beardlings. (might make these Mutants as they're a tad weaker, maybe will make a nice conversion...)
Chaos Dwarf Bull/Boar Centaur - Hired Freelance Knight.
So waddya think?