Some thoughts

[Fredmomo]

1. Group consecutive articles together to form a "book", for example, we can have "C++ - beginner" & "C++ intermediate" & "C++ advanced" article been grouped together with tag like "C++" (maybe need secondary indexing), For the drawbacks of some tech blog the authors often don't write things gradually by date and they may need to add links to his previous/next article of one series, it costs effort to find.
2. You may need to tackle the huge storage of unstructured data like images/videos as illustration and make sure the broken links are well handled.

Will update to this thread more occurs to me. All in all, it's an awesome idea.

[cirosantilli]

Thanks for the suggestions Return!

Grouping: my intention is that authors will create a table of contents themselves, and this will be shown exactly as they wrote it, so it would show their articles in the intended sequence.

Images / videos: yes, I will likely stay away from videos entirely and just let YouTube host them. For images, one dream I have is to allow storage proportional to reputation as mentioned at: https://github.com/cirosantilli/write-free-science-books-to-get-famous-website/tree/d77b18d2e7acb3558615797c36195f60dfd26306#secondary-further-features

Broken link handling: this is a top priority, links must never break and if they do users will be notified.