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@Sill had some good points. It depends a lot on the type of vine, how fast you want it to cover, how much you want to be trimming it, the soil in which it is planted and the watering regime. My biggest concern would be with access from the outside to the top of the run in the center, especially with any fruiting vine. While a passion fruit or grape vine would be wonderful for coverage, there would be the issue of getting the fruits off the top where it would be difficult to reach. You would also have the added issue of vine removal in the winter with something like a grape vine, which needs to be pruned back after the first frost. They have tendrils that grasp on and it would be difficult to pull the vines off. I would think more about a perennial vine that does does not produce fruit, something like cat's claw, tangerine crossvine or Cecil Brunner Rose. Very nice start to your chicken enclosure!