We are going to sign the contract on a pool soon. The quote has a peagravel deck (800 square feet of new decking to be added to my existing 900 square feet of spray deck) and my wife really likes travertine. So I found a company that would install the travertine over a slab at a good price so I was thinking of having the builder just lay a regular slab without the peagravel but drop the slab a couple of inches so the travertine decking would be installed level with the coping and my existing deck. any recommendations? It will be a SWG pool.