I just downloaded the sample of How to Take Smart Notes a couple of days ago. I’ll check it out after I finish my current books.
I update some of my images sometimes, but the general way it works is the same.
I think the RGB system was by r30. I’ll have to go back and reread that one. 
The site has been online for about 10 years and sometimes people come and go as their lives and interests change.
I like the idea of paper notes. I might experiment with it. My only worry is that it might require a large time investment.