layout :

[default layout]http://i.imgur.com/r2Nvr4p.png

the thing when finished : 
http://imgur.com/a/6FY8v

concept and mockup:
http://imgur.com/a/R0vvs

to build :

    docker run --rm -e keymap=default -e keyboard=frenchdev --rm -v D:/Repositories/qmk:/qmk:rw edasque/qmk_firmware