Tell us about yourself!
This is an amazingly detailed study of your oven, I just saw it about a week ago and have spent many hours with it. The Forno Bravo site has a recipe of the mix they recommend for ovens, 1 part Portland cement, 3 parts sand, 1 part lime, 1 part fireclay. Wondered what you thought of using this mix with the perlite? You did a great job and I hope to start building within a month or so using much of your post for directions.