Convert grill to pizza oven

[paros]

I have a large brick grill that I want to convert into a pizza oven.
It's too high, so I plan to lay a row of leca blocks at the bottom and fireproof stone to fire on. The chimney is too wide at the bottom. I would like to build up at the top and make a smaller opening so I can direct the fire to flow above the pizza. What is the easiest way to do this, masonry or some sheet material?
How do you get adhesion on the sides if you were to do masonry?

 

[paros]

I have a large brick grill that I want to convert into a pizza oven. It is too high, so I am planning to lay a row of lekablocks at the bottom and fireproof stone to burn on. The chimney is too wide at the bottom. I would like to build it in at the top and make a smaller opening so I can control the fire to flow above the pizza. How do you do this most easily, with masonry or some sheet material? How do you get a grip on the sides if you were to use masonry?

 

[paros]

Tear down the old grill, admin, feel free to remove this thread.