Robert, if and only if, popular mechanic magazine is around and old issues are
archived, you will find a layout and material list.
If you experimented with back height, a double back part that had a pivot
point with side end plates behind the back that would act like an under top
brace to pin, you would be home free.
It might be easier to draw dimensions to work on paper and try to move on
to making it and working out unforeseen problems.
....................bob
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