This project is not just about a product or a grade. It is the story of you pursuing what you are passionate about. At the end of this project, you will tell is the story of your learning. Your notebook is the primary source for telling your story.
What if I cannot meet my goals? What if I need to change them?
What matters is whether you persevere amidst trials. The only way to fail is to give up. A story of not meeting a goal is still a story about learning.