You have pictures of your Koop? I'd love to see them.
Almost all of the wood for my 10' x 5.5' coop/run is from free pallets that we got and disassembled. The human door and the doors for cleaning and egg-gathering are from CL or the Habitat for Humanity Store. From the regular hardware store, I had to buy a six concrete piers and 4 10' posts/beams, metal lathe (cheaper than hardware cloth and even chicken wire), screws, roofing material, some 12' of wood for the roof panel frame, oops paint, silicone caulk and 4" pvc pipe fittings for the feeder. I hope that's it (but I doubt it) for the expenses!
Expenses? What expenses? After all the building, feed, poultry care products, security additions, and vet visits we figure our eggs are costing us around $36/dozen plus half the eggs are bantam and not even regular sized LOL!!!