What is the recommended height off the floor for the drain pipe, or does it matter? We are replacing a vanity with a pedestal lavatory. We know that our hot/cold feeder lines will not be hidden behind the pedestal, so well install fancy handles, and rigid pipe. However, does it matter how high off the floor our existing drain outlet is? Dont we just need to extend the sinks drain pipe down to an S trap and then line it up with the current outlet in the wall? (A plumber that we spoke with thought we may need to raise up the outlet pipe).