Homemade pizza oven

I used the dirt from my backyard to build our pizza oven.  I poured a concrete foundation, a rammed earth base and a concrete slab on top of that to build the oven on.  Instead of buying an expensive imported oven my kids and I made 2x4x6 inch bricks and built a dome.  First I mortered standard split firebrick to the concrete slab for the oven floor then I built the dome and arch.  The chimney is built from the same sundried mud bricks.  I put a precast concrete cap on top of the chimney then stuccoed the dome and the chimney. We have been using the oven for 5 or 6 years now and the bricks have shown no deterioration from the repeated firings.