Decide which shower pan is best for your application
Sand Mix Pan
If your shower footprint is unusual, too large for a prefab or the drain placement requires customization a sand mix pan might be your best option. You can create the custom pan and slope it yourself and place the drain where you desire. Follow the link below for more information on this type of shower pan.
Prefab Pan
If you can adapt your project to one of the prefab sizes, if you need to reduce the shower weight, or install over wood, then the prefab pan might be a good option for you.
Simple Tile Shower 