1 I think there could be many great Design Challenges using basic CAD...Computer Aided Design. I placed it under CAD/CAM but now would dearly like to use it with my Year 7-8's. Here students could learn about all sorts of Simple Machines that may inspire them in later years to have a go at building useless contraptions.
1 Having students younger than 13 go online to create accounts without adult supervision could be risky.
Project Ingite by AutoDesk could help. Once your content is created or you use the projects supplied you can invite your class or individual student from different classes to make an interest group. Check it out 1