a massive breed.
Like the Brahma in my avatar, who has been seen to achieve 18" off the ground with maximum effort when motivated by the thought that someone else was getting a treat she didn't have.

Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
a massive breed.
I wanted to keep the roosts up in the roof area. The other side will have walls that can lay down for bad weather or prop up for extra shade. Good point about the nests though.If the mock up is to scale, they will want to roost on the skinny board because it is higher.
You might consider attaching the roosts a little lower... maybe 2 1/2' or 3' high. Then they won't need the ramp unless they are silkies, frizzles, or a massive breed. And they would still fit under the roosts.
Edit to add. I forgot about the nests. If you want them raised too, so you don't have to lean down to collect the eggs, then the roosts do need to be as high as you put them.
I’m not super worried about it. The top piece is folded over at the crown and then overlaps the ones below it. It might drip at the seams between 2 adjacent sheets but if it's too bad I'll run a little caulk along it. There's quite a bit of overlap between sheets. Plus all the roosts are under single sheets with no vertical seam.Do you mind if the roof leaks? I probably wouldn't in that style of coop in your climate but the panels are designed to have the ribs run ridge to eave.