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Can 1x pressured treated be had unless you get a batch made? I wouldn't waste my time with the trouble or use pressure treated up there.
How wide at the rafter spaced? Not the entire roof is curves, just the tip or edge? What do you see when you look up from the ground under the roof? Traditionally the underside of the roof or decking, which is normally a bunch of 1x or similar materials is seen, the roofs I saw in China was like it when I looked so there's maybe some influences between the two countries from 500 years back. Use bending plywood and build up to desire thickness or kerf the 1X. If the concern is appearance from the underside ( that would be my concern) finish it off with some cedar, oiled or painted, to achieve the traditional look. What's the roofing materials? Traditional Japanese tile with fancy curves? It wounds like a fun project, with plenty of problem solving.
have a pic, I like to see this.
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