Creating Kerrigan

I'm attempting to plan a conversion for a broodlord model that will eventually fit into my tyranid army. However as the army is already based around the game Starcraft i want to push this a little more and make my broodlord more like the character Kerrigan. http://www.blizzard.com/broodwar/heroes/kerr.shtml

My main problem at the moment with converting a model for this purpose is what to use as a base to build upon. Which is where, i hope, you guys come in. Does anyone know of any bodies i can use for this purpose? It doesnt have to be strictly from GW as much of the models in my other armies dont use GW models anyway.

Thanks

Bumble