This was my winning entry for a contest hosted here in CadCrowd.
URL: https://www.cadcrowd.com/contest/799-robot-desk-defender-that-fires-foam-missiles
More pictures and the final realization of the robot is available here:
http://lukabertoncelj.blogspot.si/2014/10/natecaj-oblikovanje-namiznega-robota.html