Hi. We are building a pool in a third world country where they don't have a lot of experience, unfortunately. Our contractor wants to do the Hydrozzo (like Pebble Tec) first and then the water level tile and stone coping. Isn't that the wrong order? What is the correct order of these items? Also the bench he put in is cantilevered in the deep end - shouldn't it go all the way to the bottom so no one hits their head on it when swimming? Thanks for any insights.