I dunno, LG..maybe it's just me. But it seems to me that the more "stuff" used to build CP hoops and runs, the more resistance and weight we're talking about. Frames require joints, and every joint is a potential weak spot. Without a frame for stiffness, if the cattle panel does flex, it can rebound in short order.
I forgot to answer your questions about how deep the posts are, where we drove them, and about the angle. We didn't pound them in at any angle....in fact Ken was getting owley about a few of them not being straight enough when he pounded them in. The posts we used were 6 footers and we pounded them in about 2 feet deep so they were good and solid just using a fool to hold them straight (that fool would be me) and Ken pounding them in with a sledge hammer. It was actually the only difficult and labor intensive part of the whole build. We started out by laying out the cattle panel flat, then I picked up the end and "stood it up" where we wanted that end to be. He picked up the other end of the panel and walked toward me until we had it the height we wanted. We had rocks in our pockets and dropped them at the point where the panel would meet the post and that's where we put the posts. . Once the first one was in place, we just followed it the rest of the way down. Real scientific! But it's worked great, and for two old geezers with disabilities of one sort or another it was our ideal solution.