oooo is awesome 
I am glad somebody got function working as a custom node as it was a pain working with those long material loop chains.
fwiw, the cobblestone alpha you used on page1 was made from an in-editor material function for making brick and tile textures. I was almost done with that as a content example project when I lost a ton of work due to a hard drive crash. Data recovery got most of the stuff back but the project containing all the materials is a mess since a bunch of random bits were not able to be r
here’s a video of what that looks like:
https://www.youtube.com/watch?v=HDqAwQQ1f1Q