tom, you must be a small guy actually i used to live in port orchard, wa and i remember those creepy things. somehow slugs used to make it into the window ledge in my shower. scare the crap out of me picking up the soap in the morning. also for your chicken coop. it is hard to beat cheep replacable wood. but another thought would be lightweight aluminum angles. bolted up they will be plenty rigid. will allow you to attach chx wire, should last well, and you can modify your design well.