Perlite Concrete on free form igloo

[martywatts]

I plan on making the front arch 2" lower than the inner arch to help with the smoke leaking. It appears yours are the same height?
I thought about doing that. I think it would have made the difference of smoking or not smoking for my oven. I was concerned about the ease of using the door. Tipping the door under the dropped section would work just fine.

I have also considered an inner and outer door with a damper or air control device. I may still do that. So far no more smoking. Opening up the throat made a huge difference.

I am also considering making a clean-out for the lower part of the flue by cutting a square hole in the first tile as seen in the photo below. Since I have got things working for now I am hesitant to make any changes though.