I'm not of much help regarding the costume construction but I can say that I dig this idea! It sounds really cool/unique and still recognizable! I can't wait to see photos if you decide to do it!
Masamune Date - Sengoku Basara
Luxray (gijinka) - Pokémon
*~Next con I'm attending~*
FIN Oulun animeseminaari (8-9 August 2014)
FRI Ryūnosuke Ibuki - Hakuōki: Shinsengumi Kitan