I am planning to build a portable hoop coop to use as a grow out pen for my younger birds. Those that do not show laying potential or are simply uneesed in my layer flock will be butchered at the appropriate age. I am looking for feedback on desin ideas, why people have had success with as well as what they have struggled with. I do have predators, however I mange them well and they stay away most of the time. Winters are cold and windy, summers are cool and sunny.