The first major repair is underway: a stainless steel sheet has been cut to fit and is being pop-riveted on to the original back wall. this will seal up the rust holes and provide a new lip for the top cooking surface to be bolted on to. Tomorrow I need to pick up more drill bits as I've only managed to get two holes done and riveted. I will do the oven section next, then look into insulating the firebox with high temperature ceramic wool.
This morning I spent time rebuilding the interior air baffle that "turns on the oven heat". When open, smoke goes directly up the chimney. When closed, it forces smoke to go around the oven, heating it up before going up the chimney. The fire box got a new layer of high heat ceramic wool insulation, the same kind used in metal working furnaces. The shiney metal sheet side is towards the steel walls. I have placed some recycled brick in it to see how it will look when done. With the bricks I'm choosing, it will give a deeper fire box so we can use longer pieces of wood.
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