'Maybe' gutters.
I think that looks good up to this point:
You can get plywood in 4x12 sheets. One piece per side, then an arched roof. That Tyvek will be covered by something cosmetic? Use roofing membrane instead and skip the siding?
Would the ridge be N-S or E-W?
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"If you don't read the newspaper, you are uninformed; if you do read the newspaper, you are misinformed. " someone who was not Mark Twain
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