I have been watching Jaimie of the Giant Robot Project fame build a giant robot by hand using scrapped parts for almost 7 years. He is now crowd funding on Kickstarter to sell his toy based on his giant robot as a kit!
Check out Jaimie build his robot: http://www.youtube.com/user/JMEMantzel
Support him putting educational toys in the hands of children: http://kck.st/12BVJ8x
