We use 1/2" XPS (Polyiso) panels, pour a basecoat with fiberglass mesh, a color coat with epoxy and a topcoat with matte finish. Then I install PVC boards for the window jamb, sill and trim. Then install a curved glass shower door.
Music:
16:51 - Ryan Farish - Fireflies
22:08 - Ryan Farish - Gentle Love
30:32 - Ryan Farish - It's a light
Epoxy products: https://www.stonecoatcountertops.com/products/shower-epoxy/