I think this is awesome! It shows so much planning, creativity and problem solving.
My class (self contained third graders) have been participating in science lessons all year with a general education third grade class. I would love to organize our classes into cooperative groups and have them create their own Rube Goldberg Machines. We have 3 more science units that we have to complete for our instructional focus calendar, but perhaps we could do this at the end of the year during the last week.