I just got a old Blue Diamond ceramic kiln and I am wondering if anyone has done a kiln to pizza oven conversion ? I was thinking of a barrel vault design anyway and then came across this. It is 29" inside dia. Im thinking I can use the half barrel shape placed on a base. Does it make sense to do additional layer of fire brick for more heat holding power ? The fire brick the kiln is made with is very light weight compared to the fire brick I removed from a old backyard BBQ. Will the heavier brick hold temps better ?