How would you recommended building the trusses? The plans I have show notching a piece out so it sits on the top plate. I'm not a fan of notching (even though I have never done it), but wasn't sure if you might have some better tips.
Roof framing photos from our big coop start here: https://www.backyardchickens.com/threads/large-open-air-coop-in-central-nc.1443812/post-24444353
I am added a predator barrier. I'm actually going to run the hardware cloth 2-3' under the gravel.
I'm not visualizing this 100% but if you're talking about wire underneath the coop where the chickens will walk it's a very bad idea.
Not only hard on their feet, but frustrating their natural instincts to dig (my hens can excavate down to the level of their backs in a single day).
Anti-dig wire ire is better installed either as a vertical barrier or an exterior apron.
The best options for coop floors are either a raised floor that is always kept bone-dry and cleaned regularly (I favor Deep Bedding in this situation: https://www.backyardchickens.com/articles/using-deep-bedding-in-a-small-coop.76343/) or a dirt floor managed with a Deep Litter system (moist and actively composting).