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.