Our shower stall is a knock down kit that comes with a shower pan and walls and needs to be assembled. The shower will need to be siliconed at the seams once assembled to create water-tight walls. A shower curtain is recommended. The shower pan comes without a hole, as each installer needs a slightly different location and will drill their own hole.
To assemble the shower, side panels have a bracket that go behind the back panel. The front door fits on and the shower pan drops into the assembly.