Building my DIY shower/bathroom, did I forget anything?

Houston Remodeler wrote:
How were you fixin' to waterproof the shower ?

Like I said, the shower base/floor will be covered with fiberglass (resin+cloth+resin+gel coat)

The outside insulated wall will be covered with 3/8" thick plywood and I will glue some plastic sheeting with plastic corners (4 walls and ceiling) and add tons of silicone.

I you look at the pictures I added a raised contour to the base (one side missing in the picture) the plastic sheets will end behind that and I will silicone the joint.