Ahem. So yeah.
Big Sister. Still incomplete, but I'm still very pleased with it. The score so far is ~85 hours, and ~$550. I got through this costume on hours of House, Futurama, Mythbusters, and Red vs Blue. The smell of paper mache is now oddly comforting.
Debuted at Bakuretsucon '10. Along with my Little Sister, we won Judge's Choice in Walk On and Hall Cosplay medals, but were unfortunately ineligible for construction judging because the contest was Japanese fandoms only.
Also I suck at titles.