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1 -1/2 inch roost is fine. People use branches. I use 2x2 lumber for shorter roosts. A 2x4 can be oriented either direction, it holds more weight with the depth vertical. For some reason some folks insist it be flat to protect the feet? Personally I don't get that as birds have enough down to...

Passive ventilation is large but if you make smart vent choices you will have convection which pushes the same air through much smaller holes. No drafts that way and coop air is cleaned.