Yay!!!, I'm a big fan of salvage material use and "field engineered solutions". Looks good to me. My only suggestions is for the future in that if you also garden, make your garden twice the size you need, fence it off into two sections and let the chickens into the opposite part you're not using that year and alternate each year----saves you ton's of work with mulch and fertilizer. I'm also a fan of the deep litter over a sub-ground dirt floor, but that is just me, I only clean out the Coop once a year when I want the compost for the garden---but then that's a personal choice from my concepts of utilitarian farm work.