What's the best way to install a new shower?

Susan Cerniglia
by Susan Cerniglia
We've removed a whirlpool tub which was in the middle of the bathroom. There are no walls. I want to build a wall and use a shower floor pan and tile the walls. But, is it more economical to be do it with a prefab fiberglass/plastic insert?
I also wanted to make a seat in the shower.