How do you build a low end backyard wood burning pizza oven?
You need refractory brick, refractory mortar, and a steel plate, preferably cast iron.
http://en.wikipedia.org/wiki/Fire_brick
http://www.rumford.com/articleRefmortar.html
The cast iron is gonna be the pain to find. Anyways, you basically want to build a kiln. You build the firebox with flue then you lay down refractory lining then you build a "popup" which is really nothing more than an arch directly over the fire box with the cast iron plate to distribute the heat properly. If you want doors for it, you can buy them at Tractor Supply Company, but they aren't absolutely necessary.
http://www.fornobravo.com/pompeii_oven/pompeii_oven.html
LittleBritaly wood fired pizza oven.
[simpleaffiliate source="amazon" results="5"]pizza oven wood burning[/simpleaffiliate]
[simpleaffiliate source="clickbank" results="3"]pizza oven wood burning[/simpleaffiliate]