Our middle son who is 9 has a school project about animals and he chose to do his report on beavers. He was supposed to make a shoe box dio and that was just not good enough for me so he has now put together this dio for his school report. He will show it in class and give a report in front of class about it. He will set it up and I said he will have about 20 minutes to put it together. He first drew a blue print on the idea and then built it. Now that it is built he will box it up and have it all ready .