I know what you're saying about some of the posts. I was getting frustrated with the focus on the doomsday scenario, as if being self-sufficient and sustainable wasn't a goal for today. While I want to be aware of what the government is up to, I don't want to let it get into my psyche so much that it paralyzes me. There are so many good things we can and should be doing.
PVC frames - yes. I will have to make some rectangular shapes with corners. I love bending PVC into hoops, but my space is too small to handle that. I really am on a small suburban lot. I plan to make cold frames with some old windows I have angled to catch the winter sun. Then, remove them in summer and add the PVC frames and netting to keep the deer (and chickens) out.