I am planning to build an A-frame chicken ark, similar to the Catawba or the Boughton. In looking at different designs, I ran across an interesting one on Youtube. From the outside, it looks much like a traditional chicken ark, but it has no floor except for the nesting box. The chickens fly up to their roost and have open air beneath. If I were to build one like this, I would add 1x2 wire mesh fencing on the bottom (on the ground, attached to the sides) and make the outside a bit more aesthetically pleasing, but other than that, it might work well in my climate (north Louisiana). The video can be found at http://youtu.be/vF8oPtNX1qU. Does anyone else have experience with bottomless coops like this? Any advice would be appreciated.