Well, a friend forwarded a PDF to me about how a group of Scottish schoolkids built a greenhouse out of 1500 soda bottles. This is the website and a picture of the finished project: http://www.reapscotland.org.uk/reports/greenhouse v1.pdf So of course the first thing I think of is WHAT A COOL IDEA FOR A CHICKEN COOP! Yes, you would have to ventilate it or risk baked chicken and attach hardware cloth against predator incursion if it were not located inside a protected run. But what else might prevent this from being a workable chicken coop, especially in a rainy maritime climate like mine where it never gets really hot? Take your time. It's going to be a week or two before I can collect the 1500 empty bottles from all the soda junkies I know.