Actually poop boards catch the poop so it's easier to clean up. Do a search 'poop board', you'll find a lot of info.
I hope that extension cord is attached to a GFI outlet. Cover that bulb with a cage of some sort so flying chickens don't break it, keep it dusted off so nothing ignites.
Be careful of that bucket containing your connection, they can decompose in UV light and fracture. Watch it carefully at first to make sure it doesn't leak. Might want to elevate the connection itself off the bottom of the bucket and put drain holes in the bottom of the bucket so if it does leak your connection won't end up sitting in water..... BTDT.
Looking good, can't wait to see the windows!