Very nice! I absolutely love using what is available to build things. You've done a great job! I love it! Please show us the finished project inside and out okay?
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It would be so easy to do with those ready made spaces in the walls. I'd get a big roll of brown postal paper(they sell them in huge rolls) and staple it up, drop loose insulation like sawdust/shavings, straw, foam packing peanuts, etc. down in the spaces behind the paper, then place your interior wall. Got any sawmills in the area?
Unless you are going to have an exhaust fan for the summer months, be careful totally sealing up your hen house. Chickens can stand pretty cold weather and dont really need insulation unless you live in Alaska. Coops can get very stinky without ventilation.