Hello Roger, Pete
The "flat roof" is not really flat. Its a low slope #30lb felt roof which will be tilted away from the house. At 1/4"per foot in 12' about 3". So a gutter and down spout will be in the leading eadge south and west.
The challenged is not necessarily making the details work functional but make them look good also.
I may abbandoned the l-shape and go back to the rectangualar 16'x20' and make it a hard top, however the L-shap had shorter spans. Then maybe incorporate the fire pit. dunno???
There are many examples of flat roof and uncovered balconys done in the midweast (house in Chicago).
And an update....more ideas pondering before I get serious
Thanks,
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