The barrel vault pizza oven design is generally rectangular, for the main body of the oven. The shape is determined at the foundation. The size of the barrel vault pizza oven varies depending only on personal preferences and intended use of the oven. The oven interior space is the most important. To tricky part in designing a barrel vault is the dome. It requires formwork to hold the bricks in place before the cement harden up. This framework is considerably expensive; to design a barrel vault pizza oven with fewer expenses, it is recommended you use locally available materials e.g. half barrels.
Further information: Make your own barrel brick pizza oven and outdoor setting and How to build a pizza oven