I am thinking that my arch firebox needs a little more depth. I am considering buying some 6" Channel iron and putting it around the top of the arch to raise the pans a little bit. In doing this I figured it would be easier to install my AOF too. I figure I will use blanket to insulate. Any thoughts/experience doing this? My other thought is it would be easy to re-tin and add an airtight front in the future.