Corner Build Pompeii style oven with outdoor kitchen

[carneage]

Hi there all
i am starting an out door kitchen with a corner install of the pompeii style oven (i will be making the 36id High vault ceiling) i have got most of the supplies and products, i have studied and checked so many details, i think i understand what i need to do but i just need some help on tips and tricks for the build, plus i am a little confused from the pompeii instructions about the door and arch detail, (section 8 in the Cd pdf), i can not seem to understand how the reveal should sit, it says not to go square but it does not explain how much set back it should have.
also who sells the fire blanket in australia and what would it be worth?
also who has made one of these near the central west nsw that i could go and have a look at to see the detail of the opening, (or who has some great detail shots that they would be happy to share)