How to pour a shower pan - great website
Kohler K-9054 Salient receptor with right-hand drain, 60 x 30 shower pan
Build your own concrete shower pan -- it isn't nearly as hard as you might think!
DIY Walk-In Shower: Step 3- Prep For Tile - DIYdiva
Kohler cast iron shower pan
http://www.rvmaintenanceoptions.com/rvshowerpans.php has some information on shopping for a new shower pan for a RV.
How To Build A Shower Pan And Guides ~ http://lanewstalk.com/tricks-how-to-build-shower-pan/
From your subfloor to a completely tiled shower, this tutorial for how to DIY a shower pan has all of the supply, process and instruction details you need
DIY Bathroom Renovation: How to Build a Custom Tiled Shower Pan — Apartment Therapy Tutorials
walk in shower marble tile