I do not have the skills to build it but looking at SMOT I realized that a Caloway motor is the way to go. What could take the place of the ramp in SMOT a Davinci type device inside the cylinder of a Calloway device. What do You think?
http://www.callowayengines.com
http://en.wikipedia.org/wiki/Simple_Magnetic_Overunity_Toy
http://www.google.com/imgres?imgurl=http://www.antiquark.com/img/leonardo-perpetual-motion.jpg&imgrefurl=http://www.antiquark.com/2005/01/square-earth-perpetual-motion.html&