Very nice work. 

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I used 1"*1/4 lavalock gasket on the cook chamber door and 3/4"*1/8 on the the firebox and chute doorsHow did you seal your doors against the frame?
What is the small square on the front side by the chute?Bit further on now. All sides bar one plated.
It's a cut out for my temp controller to sit inWhat is the small square on the front side by the chute?