There is a visual breakdown of the construction of the oven. It is essentially refractory material with insulation covered with stainless steel (inox).
The cost is 530 Euro fob Florence, Italy.
They cooked the pizza at 400 degrees Centigrade or about 750 degrees Fahrenheit.
At that temperature, you can't add 10 pound of cheese.
Note the thin crust.
In Italy, there are artisans that travel around building these oven by hand for restaurant. The pre-cast units are more expensive. Consider the costs of fueling these units.