I think 8 grade is too old to make silly toys, and time to do some serious stuff: 1. Carpentry project 2. CNC machining project 3. Microelectronics: assembly

I think 8 grade is too old to make silly toys, and time to do some serious stuff: 1. Carpentry project 2. CNC machining project 3. Microelectronics: assembly from ready parts 4. Drone or aviation related project if he is into computer stuff, just teach him how to hack computers and websites, the pentesting stuff.