Here is a challenging project for you to try.
CAD or Sketchup is more for designing and modeling smaller objects that might be made in a factory....like a coffee mug.
Now that you are a 'Sketchup' ninja, it's time to venture out into the real world. You will be "Reverse Engineering" an item for this activity by measuring an actual object and using those measurements to create a sketchup file.
When you have finished and saved it, show your drawing to the teacher to get Activity 7 signed off.