To everybody who suffers from wet dreams about huge MIDI controllers made for Ableton Live: don’t watch this video! 
Julien wrote a decent documentation, which is located under http://www.julienbayle.net/diy/protodeck/
Alternative link to the MIDIbox Wiki: http://www.midibox.org/dokuwiki/doku.php?id=protodeck
Discussions about the project for people who are interested to do something similar: <___base_url___>/index.php?/topic/14162-the-protodeck-big-controller-for-controlfeedback-of-ableton-live-via-max-for-live/&do=embed