hi guys,been looking into getting a quadrant shower enclosure for the bathroom but can't fathom out how you run supply pipes to it if as in my case the shower will be on a solid outside wall.is it a case of digging the walls and plastering over or can you get a mixer unit that uses exposed pipes.also what opinions do you have on shower trays,i notice a lot of the sets come with an acrylic shower tray with adjustable feet to facilitate the waste,are these any good or are stone resin ones superior,thanks in advance.