Cosplay Con-Quest we are trying to gain more support for a nation wide cosplay site, if i can get more support and more members i can turn it into a mecca for cosplay! where we can share cosplay knowledge, up comming con's, Photo's and more. Please help us out, Join our Group!
He used a lot of cardboard, tennis balls, duct tape and other misc objects. As for how he exactly constructed Karasu, I couldn't tell you since he says it's too complicated to try and explain. He just does it, he can't explain his construction process.
If you're really interested, I'd suggest e-mailing him.