My plans are to build a cinderblock/cedar smokehouse. The outside dimensions will be 40"x40" 6-7' high. The inside of the smokehouse will be 24x24x32 for the cinder block and 32"x32"x40-52" for the cedar portion. I plan on putting the fire box 16" away and using a 8" square clay flue surrounded by cinder blocks. My fire box will cinder block with firebrick lining the inside. I planning on it being 24"x32"x16" on the outside and 13.5"x15.5"x16.75" on the inside. I just wanted to make sure my firebox is of adequate size for my smokehouse before I go ahead and build it.