Fixing the Kiln

Here's one of the new roof sections semi-cut-out,and [second picture] another one sitting more-or-less in place [the one behind it hasn't had its arch cut yet]. I'm going to need 18 of these pieces for the roof; then I want to re-make the flue at the back of the kiln,which has become rather constricted,and a section of saggy wall. And the door.