I do not. I budgeted X amount, then considered my options from there. I elected to build a 6x8 shed essentially. For the price of a prefab house big enough for 12 birds, I was money ahead to build something much nicer and stronger. That way it functions how I'd like and I got the satisfaction of building. As for general design, I like what you posted as its fairly mobile. I barely have flat ground, so I went with a permanent fixture. This design is low key, light and would have its benefits. All depends on how many birds you want and why in my opinion.