What a great and helpful guide you've written. Respect.
Just updated it!
Why didn't you share the URL to sign up in the article
Take a look at a free sand material created in Substance Designer by Derk Elshof. Having a hard time dealing with the ground? Study this breakdown and build your own substance.
A material study of sand with pebbles and seaweed. A fully procedural material made with Substance Designer.
I uploaded the .sbs file to Gumroad in case people want to see a breakdown of it.