We made a built in shelving unit
To begin we started with the edge of the shower tile and cut a hole in the wall until we hit a stud.
We had 12 inches and then we went down about 4ft.
on the outside of the frame so they would not be seen when the unit is placed in the wall.
Then we cut the back beadboard panels to fit each square and nailed then onto the back
Then we pushed the unit into place
Then we took some picture molding and put it around to cover up the gaps