We stock steel target stands as well as AR500 targets. Keep us in mind next time you need some.
Shepherd hooks work pretty good as long at the plates aren't too heavy.
IMO, a sturdy shepard's hook can't be beat for a quick solution to hanging a gong. They're easy to transport, go up quick, and take down just as quick. If you shoot through one or damage it, you're not out a lot of money. On the other hand, they definitely aren't bullet proof such as an armored stand would be, but if you're on a budget, they're the way to go. A sturdy shepard's hook can handle a 10" plate pretty well, I've done it.
Thanks for the link and info. I do not plan to use chain, I will be using conveyor belting if I go with something that they hang freely from like the design you have. I've got a few ideas on some easy take down type stands but need to build a couple to see how or if they will work.