I thought the peek-a-moo was funny

That old metal nest bank is
very cool.
Nice sized building for sure.
Hard to say if the structural integrity is solid with everything covered up......
...might be concerned about moisture around foundation/bottom of walls.
But I guess if the cows haven't knocked it over <shrug>
Chickens will be great for gleaning undigested grain and fly larvae in the cow pies....
......and spread it around for ya.
Any concern with rodent infiltration?
Those sheathed and insulated walls could be mouse/rat heaven.....
.....especially once you start serving up the chicken feed.
Not sure you'll have enough ventilation in the long run,
chicken respiration and poops add moisture to the air....as do open waterers.
You'll want to add some open all year vents up under the front and back eaves,
and some top hinged and glassed windows to open in the summer and for light in the winter.
How will you keep water thawed in winter?
Think about using horizontal poultry nipples from the get go once you get chicks.
https://www.backyardchickens.com/a/aarts-heated-waterer-with-horizontal-nipples