Loving your coop CapricornFarm -- you're doing a great job!
My property had 2 ancient 10 x 12 coops on it when I bought the place. Not sure how old they are, but I'd say at least 60 years old. They are built super sturdy from good old hardwoods. Problem is that they are on dirt and have groundhog burrows under them, critters inside, lopsided, all kinds of gaps.... I decided to tear them both down and build a new coop, but didn't work out as planned.
I rented a construction dumpster and proceeded trying to dismantle one coop. It was the better of the 2. First I just tried prying boards off. Then I cut through most of the supporting framing with a chainsaw and tried to pull it down with my truck. That took several tries. Now the roof is laying on the wood floor -- same kind you'd have in a house. There are several layers of old crumbling asphalt shingles in it. Bought a sawzall to cut through the roof, but even that takes forever and completely wears your arms out in a short time. They used lots of nails -- big, fat, looooong ones, so I can even pull those out.
I gave up and decided to patch up the other coop and use it, not wanting to wait another year to get chickens. This one didn't have nearly as nice flooring and was in really bad shape. Hence the name Crooked Chicken lol. Everything is crooked. Even the new roof on that has a big bow in it. I found stacks of shingles in the barn when I cleaned it out, so had the guy mix the shingle colors and I love it. Oh well. I am still making improvements. I also made a lot of errors in building the run -- it was hot, humid and I was in a really big hurry. I likely will redo the run next spring before it gets hot. Still have to put roof panels on run and get everything painted (only 1 wall painted so far). Bought 3 cans of oops paint yesterday, so might use some inside because it's rather dark.