sci-map sounds very interesting. Have you looked at metacademy.org before?
They did a lot of good work on the data model (concepts, resources, learning pathways, etc), and also collected a lot of content, mostly on computer topics.
https://metacademy.org/graphs/concepts/bayesian_logistic_reg...
Sadly the project is no longer actively developed but if you haven't seen it yet, you should definitely check out for inspiration: https://github.com/metacademy