Waterproofing a wet room / shower: System components - Schluter-Systems
DIY Host Amy Matthews shows how to pour a concrete base for a shower on DIYNetwork.com.
Tile a Shower: Waterproofing membrane Waterproofing membrane is brushed on. It's widely available at tile suppliers. Read more: http://www.familyhandyman.com/tiling/tile-installation/tile-a-shower/view-all
Build your own shower pan to accommodate any space:
concrete shower pan vapor barrier sealing underlayment