I'm actually lagging a few Simpson 4x4 Post Bases into the concrete, installing pressure treated redwood, slipping the white PVC over it, then buying 2) 6' white PVC fence sections, cutting one in half, for the back and walls. I'll add a hinged door, a sloped PVC roof of some type, a solar light (it will be dark n there!) and some towel hooks. My primary concern is rot and rain protection.