Metal pizza oven convert to earth oven

[marionstyles1979]

I have a metal box type pizza oven which doesnt retain any heat. I 'm going to try to insulate it by building clay.sawdust sand  mix around it . Has anyone done this or am I better to throw it out and build an earth oven from scatch

[oblertone]

My 2p: keep it to one side and use it while you build a new oven, at least you’ll have pizza while you labour.