Use of one piece shower/tubs allows for an economical product for secondary bathrooms.  These tub showers are large and often impossible to carry upstairs.  For this reason we usually try and deliver them to site just before the crane arrives to lift the roof trusses.  For the master bathroom we tend to use fully tiled walls and bases.  Here is a series of photos from today of a tub shower being lifted by the crane and placed into the second bathroom upstairs.