I just discovered today that I am allowed chickens, so, of course, now I want some. I can't afford any of the gorgeous coops I've found on google...and decided to recycle myself one. I have a pet carrier (the kind with the metal gate/door) that I don't use anymore. I want to use it to convert to a coop. Will this keep my hens warm enough (I live in Nebraska) during the winter? Is there any danger by using plastic?