Decided to purchase pre-made units (coop/run plus an extension added few weeks later) to house my two buff orpingtons. Both pieces purchased online. After assembly I stained everything with Helmsman Spar Urethane (2 coats). I also prepared the site for the coop by making a matching bottom from 2x4 and 2x6 and stapling the hardware cloth on the bottom. So far (about 5 weeks into the ownership) I see no signs of any intruders (I see a rat from time to time in our neighborhood, but fortunately no foxes or raccoons).