How to pour a shower pan - great website
DIY Walk-In Shower: Step 3- Prep For Tile - DIYdiva
How To Build A Shower Pan And Guides ~ http://lanewstalk.com/tricks-how-to-build-shower-pan/
Installing a Shower Pan – DIY real
http://www.rvmaintenanceoptions.com/rvshowerpans.php has some information on shopping for a new shower pan for a RV.
DIY Bathroom Renovation: How to Build a Custom Tiled Shower Pan — Apartment Therapy Tutorials
Image titled Install a Shower Pan Step 6
Build your own concrete shower pan -- it isn't nearly as hard as you might think!
This illustration shows the basics of how to build a shower pan.
How to waterproof and tile walk-in tile shower DIY- step by step instructions - part "1" of 2 - YouTube