I just want you to 'be happy, don't worry'.
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How much roof overhang do I want? I have been using 6" so far.
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Zero. Your giving up a foot of interior space.
See the roof in the picture at #102? The arch is made up of three pieces. Use just the lower two, and you have a Gothic arch. Zero overhang (less maybe a gutter (1-1 1/2")) and good headroom with a six foot wall.
Polymetal is so last decade. Now it's stainless steel.