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The chariot of tzeench is described in the codex as being pulled by two screamers. It is also a flying chariot, so I would ditch the wheels from the model you have up there.

For my Herald, I used this model:
http://www.games-workshop.com/gws/catalog/productDetail.jsp?catId=cat440108a&prodId=prod1250028a

However, you can really make it look like whatever you want, as there is no official model for it. So have fun!