I did a similar conversion of a building that was the milkhouse on the old dairy farm we bought a few years ago. It's got a concrete floor and the walls are concrete halfway up. Had to put the pophole four feet off the ground with a ramp!
I know it's been a couple of months since you started...
Whoever said this either never had blue ceilings, or never had spider problems in the first place!
I've got blue walls & ceilings in my coop (because that is the paint I had on hand) and the spiders don't seem to be scared of it one bit. Seems like cobwebs are more of a problem in the chicken...
Since the chickens naturally want to go to sleep at dusk, I didn't want to have the light come on in the evening. And since dusk comes at a different time every day (as early as 4 pm in the winter or late as 9 pm in the summer), I didn't want to have to keep adjusting the timer.
I got hold of...