Because I am using 9by12 tiles for the shower, I had to choose whether ceiling pattern would match the back wall or the sides and I chose the back wall. It looks more continuous and larger that way. I also added two corner trays for holding shampoo and bath gel. Grab bars will go on side opposite the shower head.
The transition between the epoxy floor and the dry white walls was very rough in the basement so flexible wall base is the solution. It is usually applied in commercial buildings and some residential baths and kitchens and it not expensive. It will also make it easier to keep the floor clean as it has a cove edge that bends between the floor and the wall.