I hate to be the one to say anything, because you've done a great job, and have put in a lot of work into your boxes, but there's a simpler, more efficient nesting box if you're interested, with a lot of benefits. There's nothing wrong with what you've built, it'll work fine of course, but you may be interested in this.
It's a community rollout nesting box. My box is 24 inches wide, and is rated for use for up to 20 hens, I use it with 12 hens.
As you can see here, 2 or 3 hens can use it at once.
No poopy straw or eggs anymore, the eggs roll out the back of the box, into the collection box, clean as a whistle. It also prevents egg eating from starting in a flock because the plastic mat is on a slanted wire floor, so the eggs immediately roll out from under the hen, and out of her reach, the moment she drops it.
The mat and wire floor let debris filter through the mat and wire floor, down to the ground. Every couple of weeks I pull out the mat, shake it, and put back.
Here are the eggs ready for collection.
I got mine from HenGear.com for $119, but if you're handy, and it looks like you are, you can build one yourself. Hengear.com has different sizes available for larger or smaller flocks.
I also liked this box is reversible, the eggs can roll out beneath the perch in the front, or like mine, out the back, and through the wall, so you can collect the eggs without walking into the coop. There've been times I was in a hurry and didn't have the right shoes on to go in the coop, so that can be a handy benefit too.
Everything is in the box when you get it, to assemble the box either way, front or rear rollout, your choice.
Here's a photo of the front rollout.
The big benefits are, number one CLEAN EGGS, no more poopy eggs!!, I used to hate washing the protective bloom off my eggs because the eggs were poopy, the tremendous space savings of having just one box, the simplicity of only having one box to check, the savings of not building multiple boxes, no more poopy straw to add and remove from multiple boxes, and finally, the ease of collection, including through the wall collection if you'd like that.
This method has so many benefits, I can't imagine anyone using the old nest box system once they discover this system.
If you'd like to build one, search on rollout or roll out nest boxes, there's several threads on how to build one if you'd rather do that, than buy one.
Good luck with your project, that's a nice coop you have!