Recycled propane tank head ovens – metal work, sheet metal fabrication. Carl made an interesting garden oven, look at it from his images. It constructed from a large propane cylinder tank head made of metal. This oven is called – TankHead Pizza Oven. There is the firebox designed underneath which heats up the smaller oven and oven floor positioned on top the diagram explains it further. Propane propane tank head is suitable for constructing pizza oven, metal sections on the outside.