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Marvin the Robot is a RC controlled lawn mower. still in beta. what is done right now is motors are mounted to a simply 2x4 frame. after I get a metal frame welded up I'll mount my lawn mower to it and add the wheelchair motors, batteries and controller box. http://www.flickr.com/photos/38834202@N06/sets/72157620729703133/ ( here is my flickr set with mouse over notes)
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/marvin-the-robot