If you want what's best for the birds then all others concerns are secondary. Birds have very different housing needs than humans.I want their home to be the very best we can provide, and it's not just a home for them
A chicken coop gets extremely dusty. I wouldn't want children hanging out in there. They would do that outside. In a very large predator proof run with a solid roof. Chickens don't need insulation. They already have it.
What they need is HUGE amounts of ventilation. Most people think a little window is all the ventilation they need. That's ridiculously insufficient. You need to think on terms of sq ft, not sq inches. Try to shoot for 1 sq ft of permanently open ventilation per bird. The ventilation designs should be for maximum housing capacity of the structure, not what you currently have. Maximum capacity is 4 sq ft of floor space per bird. You can get away with 3.5 sq ft per bird if you have poop boards as they provide another level to hang out on during long winter months when they can't or won't go out.