I looked back over a "laying house" design from the 1950's I had saved and noticed that they went with a style of nest box that I have not seen before. Looks to me like a side entrance!
The overall dimensions look to be 12 inches at the rear, and 2 foot 6 at the front. 2 feet deep and 3 feet wide. Roomy!
Interestingly, this is all internal to the coop/laying house. They have an enclosed nest box with a hinged lid, all within a building. No "exterior" access to the nest box.
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That's called a community nest box. I mentioned those in my post above. Just guessing but that one is probably good for 15 or so hens. There should be a chicken entrance on both ends, not just one end. And yes, usually no exterior access though you could probably arrange that. Could even make it a roll-out nest box with a little ingenuity.
Those aren't that unusual in walk-in coops for small producers. They are easy to build, don't take up much room, and are not good for broody hens.
The boxes aren't attached to the coop itself and can be removed for cleaning. The lid can be latched up to the window frame above. Due to the way the lid sits, it's enough to hold the unit firmly against the wall. More photos in the My Coop link under profile.