Your avatar shows like 30 birds ? No wonder they do not sleep in it?7 nest boxes is overkill. How do I know? I made 6 nest boxes - only 3 get used, but only 1-2 will have the eggs because they'll all pile into the same box.
Just looking at the dimensions and design mentioned....My enclosed coop is 5x8 and 3ft off the ground; the front of my coop is flat and this is where I put my nest boxes - the boxes that get used are the 3 underneath the coop accessed by chickens from the run only (flip-down access door), nobody's laid an egg in the upstairs coop in 2yrs (they don't sleep in there either, they prefer the run)