Modular Kit - Rock Material

This is the material for the 'Super Rock'. It has an intelligent material to retain texel density when scaled and it's vertex paintable. It seems really inefficient and messy which makes me think there is definitely a better way of doing this. If anyone has suggestions to cut out unnecessary and redundant steps leave me a juicy comment.

 I made the diffuse textures with pictures I took of rocks in Arizona. It was satisfying in a way to make a texture with nothing pulled from the internet.