My thoughts,
All of it is incredibly ambitious.
However, knowledge collection with supporting AI technologies to make collection and curation easier is highly needed. There are no doubts about that.
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If we get the collaboration design and related features right...
I would first lay some foundation stepping stones of knowledge collection of questions with simple AI augmentation as you detail (context feedback loops will be especially important. Example: Car(train carriage), Car(automobile) ). And then iterate and expand with community involvement on providing answers through whatever mechanisms, AI, programming, might make a young student smile.
Context will be the thorn to constantly pluck out and disambiguate. But don't be disheartened since even the largest Q/A and Search companies have a constant struggle and have slow improvement processes. Good things sometimes take time.
I wish you and the team the best of luck, Adam.