The most important thing you need to add to this coop is . . . . CHICKENS! 

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My chickens don't know your chickens! Yeah they poop at night but I see them pooping all day long as well.My chickens rarely poop on the coop floor. Most pooping is done while asleep at night so the poop board catches it.
Apologies to OP for getting off the rails here...
I don't know what I was thinking. The latitude and where we are on the time zone effects it, not just time of year. So when does your sun set?
LOL Yes! They poop all day, but they are outside all day doing said pooping. They go inside long enough to lay eggs then run back outside. Then at night they roost...and poop. My poop boards catch it all, or at least a good 99%. Come morning off they run outside. My run is a bed of wonderful fertilizer.My chickens don't know your chickens! Yeah they poop at night but I see them pooping all day long as well.