How to pour a shower pan - great website
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
How to Build a Shower Pan | The Family Handyman
How to waterproof and tile walk-in tile shower DIY- step by step instructions - part "1" of 2 - YouTube
A wikihow on tiling a shower with a pan and step by step videos
DIY Walk-In Shower: Step 3- Prep For Tile - DIYdiva
http://www.rvmaintenanceoptions.com/rvshowerpans.php has some information on shopping for a new shower pan for a RV.
Bathroom Small Shower Design, Pictures, Remodel, Decor and Ideas - page 7
DIY Bathroom Renovation: How to Build a Custom Tiled Shower Pan
How to tile a shower.