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Nothing wrong with using treated lumber for rafters, just not necessary. Using it on the sidewalls under hardware cloth is a good idea. Treated lumber is usually sold wet (and heavy) but will be about the same weight as regular construction lumber after it dries. Slabcrappy is right...you...

Correct....purlin spacing has minimal effect on rafter requirements. It's more to do with how rigid your roofing material is. Just curious though, why are you using treated rafters? Are the purlins treated also? Paul

I understand budget constraints, but just for fun I ran the numbers through a rafter calculator. www.awc.org/calculators/span/reversecalc/reversecalc.asp I used these parameters: Spacing: 24" Wood Species: spruce/pine/fir Deflection Limit: L/180 (the lower the number, the more deflection...

I think the hurricane ties will be sufficient. Cutting birdsmouths out of 2x4's will reduce the strength of the rafters (assuming you will have an overhang for eves) and have minimal structural benefit. I think for a 10' span, you might consider using 2x6's rather than 2x4's though. I'm not...