I don't know what the original poster means by the term "composite BIW". Does this mean a body-in-white made of composite materials (fiberglass? carbon-fiber? all-metal but different types? or what? the only quasi-mass-production example of which I know of is the BMW i3) or is it just a spurious word given that "any hybrid car" implies a mass-production vehicle, of which all practical examples (Toyota Prius, Ford Fusion, Honda Insight, etc) use conventional construction with steel stampings spot-welded together just like any other car?
200 kg is about the right order-of-magnitude number.
I don't have the exact number for any such example.
It will help to know why the original poster needs this number.