Great pictures demonstrating how to safely cut feathers on a wing. This is the same method I had been taught to do for my macaw parrot's wings. Only one wing each. This can seem a difficult task to do for a bird's safety but this article makes it clear and simple.
It's just showing us a coop kit you sell. It's very nice, but this would need building instructions, blueprint or diagram, materials list, etc. so someone who liked it could build it.
It sounds like it was a very inexpensive coop and was interesting how you started explaining about ripping pallets apart, but then it would be helpful to see how this was built. A few more pictures explaining how you built it would be nice too.
It's a cute idea to let 3 to 11-year-olds build a coop, but it shows. It's not finished either, as you're asking for suggestions for a door, windows, and roost. Second-story nests aren't a good idea, as up there is where venting would need to be.
I agree it's too small for your chickens, but that said, this explains a lot how you made it and good use of repurposed items, but I think it would be so much easier to read if you could organize it better. It's just hard to keep up with what you're doing.