There're PDFs (3 notes per string) for Major, Melodic Minor, and Harmonic Minor - but I don't see any lessons or PDFs for natural minor. I understand the intervals so it's not a big deal, but just wanted to mention this here in case it was an oversight since seems odd there's a breakdown of the other minor scales except for the natural.
The Natural minor scale is within every 6th note degree of the major scale. Regardless of what key you are in, It's the same notes. If I'm in the key of G major, the natural minor for G major would be E natural minor. That would be E-F#-G-A-B-C-D. So I'm guessing the 7 modes section applies to this as well. Same order?
Right I understand the intervals (♭3 ♭6 ♭7), but this post was meant to be more about the lack of a 3-note-per-string PDF (or lessons in general) when there're the same diagrams and lessons for major, melodic minor, harmonic minor - but no natural minor. Personally I make my own diagrams, so it's not a big deal, but taking that same argument that the students can figure it out themselves, then you could argue there's no need for lessons or diagrams on melodic minor or harmonic minor since all you need to figure anything out is major.
There is a pdf for natural minor in the modes section of level 1 theory. Natural minor is the same as the aeolian mode of the major scale. It's the sixth scale degree.