last year i went to akon (probaly going there again next week) and Vash was there, the costume was really good detailed even to the the silver things on his metal arm and a custom gun, pictures are here:
http://www.geocities.com/junjun1485/cosplay/61vash.JPG
http://www.geocities.com/junjun1485/cosplay/62vash2.JPG