I saw where somebody here posted about getting an old aluminum sign from the county resell yard or wherever and using it as a pop door and it hit me where to get something like that for free. Ask a real estate agent! Often times agents change companies and end up with a bunch of useless signs, I opened a new brokerage a couple of years ago and went through 2 designs that once I got them I did not like and started over, I could shingle a coop in aluminum signs! If anyone asked me I would be happy to give them away and so would any other Realtor we want you to remember us when its time to sell or buy My signs are 30"x24" so cut in half that would make two doors I am in Idyllwild CA should anyone need a sign... That same post the person used PVC lattice cap for the channels an 8' section sells for like $8-$10 at the big box stores. I am full of ideas, no coop no chickens yet, lots of ideas....