HOWTO still references the long-stale kOS limitation of requiring all Kerboscript files in the same directory. This limitation was eliminated in kOS v1.0.0.
HOWTO also states that the project folder structure includes /library_ksm, which isn't in the repository.
LIB_MANAGER used "git@github:..." instead of "git@github.com:..." in one of the commands to be executed.
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I will be submitting a PR for these straightaway.