build a pompeii oven 51 " for my little restaurant in Algeria

[benben]

Hello everyone, I am trying to build a 51" Pompeii oven in my new little restaurant, I made the base and now I begin the dome, I'm really afraid to make a mistakes so I ask you please, advice and help especially that it will be the first pompeii oven in Algeria.

I will also tell you that I am not very very good in English

Thank you very much in advance