As promised on the other "help me build" thread,here is my solution for the cordless to corded drill :
http://www.labellenote.fr/file/Woodw..._corded_06.jpg
I have fully describe the motivation and how to on my site in the following article :
La Belle Note - Cordless drill corded
And here is a video of the result :
https://www.youtube.com/watch?v=okXuf7ZuFHQ