On this job we removed an old shower tray and replaced it with a new one, we built the wall out to accomodate the shower tray fit snug and this meant we could build a shelf within the wet area as well.  The adjacent wall was fit with a row of units and wall hung cupboards to provide every piece of furniture you could need.  We replastered the ceiling to provide a smooth finish and tiled up to the ceiling around the whole room.