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Actually metal sheds are pretty easy to modify since it has structural supports. I cut a chicken hole in the side with a door that I can open and close from outside the pen. I have insulated the top with spray foam (which is kinda messy but well worth it). The sides of my coop are not insulated yet because I haven't decided how I want to do this and still keep with the easy sanitizing. On the opposit side of the chicken hole I have the middle wall panel where it can be removed in the summer to allow good air flow and I have a mount for the fan that I turn on to keep the birds cool. I also have a heater I put out there when it is cold that mounts above the roosting racks (2 old metal futon frames I found in an empty lot in my housing covenant). These are suspended from the ceiling joist and the side frame and can hold about 150 lbs each.
Next step I need to do to modify my coop is reinforcing the roof and putting in some metal posts in each corner to give more support to the whole structure. How I am going to strengthen the roof is to use long metal straps used for bundling lumber and run a line through each joist along the r panel groove to meet the middle wall frame. This way if a heavy limb does fall (and I have some hugh trees so that is a possiblity) it will not collapse the structure completely.
The one thing I found is that no matter how much you treat wood, ie paint, etc. it does not hold up to chicken poop. Learned that the hard way. It also is a breeding ground for mites and bacteria. I have not wood in my coops and I have never had mites.
One suggestion for the floor of your coops. Get a big tarp large enough to cover the entire floor of your coop, with a little extra, then use pvc or metal pipes to keep it in place. This makes cleaning a breeze. Just drag out the tarp and hose it off. Let it hang dry and put it back in. It will also save your flooring. Oh and even concrete is not immune to chicken poop so use a concrete paint before setting you coop on your slab foundation.
I hope this answers some questions about using metal buildings for coops. They are pretty flexable and are easy to modify.
