Built from scratch shower pan liner
DIY Removable Cedar Shower Floor Mat build for patio area to put over landscaping rocks to extend patio
Install the shower pan liner.
Use Oatey PVC Shower Pan Liner Kit as a waterproofing membrane while constructing a tile shower base. Made of thick flexible PVC sheet.
Oatey, Corner Dam for PVC Shower Pan Liner, 41602 at The Home Depot -custom made shower