Looks great! Do you have plenty of ventilation?Yes, I use sand in my coop currently. I like it because it absorps the moisture in the poop, along with any smell. I live in the South so it is warm half of the year. This means FLY SEASON! Using sand TREMENDOUSLY cuts down on the flies... It is also super easy to clean and cheaper in the long run than shavings.
Yes, the nesting boxes will be at ground level in the coop. Here's an example -
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I didn't think about fencing off some space for the broody. That changes things a little. Going back inside my drawing tool to make some changes... In the meantime, this is the front and side elevation of the coop I have in mind.
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You don't have to have a fenced area for a broody, only if you have the space to have a set up like that when you have a broody it would be handy.. then take the fence away when not needed. I have a 2nd coop within a larger coop area for broody to sit on eggs but open it up to all the chickens when I don't have one in there.
Lots of people on here would have different set ups or ideas for broody hens.. some just move the broody to a large cage to brood in peace then put them back in with the chicks when the hatch is over.