This illustration shows the basics of how to build a shower pan.
Bathroom remodel ideas
http://www.rvmaintenanceoptions.com/rvshowerpans.php has some information on shopping for a new shower pan for a RV.
RV shower doors
A wikihow on tiling a shower with a pan and step by step videos
Shower pan, already sloped, tile over (saves time of custom mud bed pan) DO NOT RECOMMEND. IT WAS TERRIBLE TO INSTALL.
Master Bathroom Remodel
DIY Walk-In Shower: Step 3- Prep For Tile - DIYdiva
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
from the blog
Build your own concrete shower pan -- it isn't nearly as hard as you might think!
DIYs Crafts & Recipes group board
Centsational Girl » Blog Archive Bathroom Remodel Complete - Centsational Girl
DIY Bathroom Renovation: How to Build a Custom Tiled Shower Pan — Apartment Therapy Tutorials
How to pour a shower pan - great website