Bloody good research Dave!
So the way they are stowed behind the set, the dimensions are 15 5/8" (or is it 3/8?) long x 11 1/4" high x 3 3/4" wide.
The screw pattern for the lid of the 18 set box can be seen also by the notches in the case in the line drawing. ie 4 along the top and bottom, 2 down the right hand side and just 1 in the middle on the left. I wonder if the 11 set screws would be the same? Ron
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