I used Feldons Calculator for all the sizes. My question, the FB is only at 96% will this still work? The main fuel will be charcoal, probably will use the min on method. CC will be 20" 48" long FB 16" 24" long. All the material was free so trying to make it work. If I need to make a larger FB I do have 2 pieces of 24x48x3/16 also free. Any input will be GREAT!