The rafter 2x4's going cross ways sit on top of another 2x4 that sits on top of the corner posts. They are not hung from the side. I did omit that detail in my previous post.
You can see a rafter temporarily set up in the top right hand corner of this photo. And you can see the 2x4's framing the top resting on the wall posts. The remaining 2x4's facing long side out around the top are semi weight bearing as they fit into notches cut in the side posts, but are more for area to attach the hardware cloth and eventually furring strips to.
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We've had no issues with snow loads and a freak once in a decade storm that blew thru with straight line winds up to 70 mph. It caused a lot of damage on our street from downed trees, including two massive oaks behind the chicken coop that got taken out.
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