I salvaged some flat rocks from a customers property and they would like them to be used as a walkway approximately 60 long. The rocks range in thickness from 1-4. How do I make the surface of the walkway flat with a solid base? I have experience installing pavers with the usual materials (base material, bedding sand, edge restraints, etc ) but this project is out of the norm. I am assuming that I will have to hand tamp the base material depending on the thickness and contour of each rock. Would I just leave out the bedding sand? Or place sand where needed?