I recently saw a metal backsplash - solid sheet not tiles. I really liked the look. I need help with the how to. Which metal is best to use? What gauge should be used? Can it be installed over an existing tile backsplash? Is it difficult to work with? As it is metal will there be any problems with the outlets & water? The area I will be covering is about 9' x 8'. What could I expect to pay if I brought someone in to do the work?