Brian, here's 2 pics. The first one from my original post showing the trees I first put out. They're the 2 tallest ones in front of the open shop door. The head space above the top horizontal pieces of 1" PVC is the important part. It took right at 13" of head space to suspend a 5' section of 4-in PVC with all the amenities from the bottom. That's important to me, because that makes it repeatable. For what you're wanting, you'd only need the head space part.
The second pic is of something I hobbled together this morning to show a close up the rigging. I only used rebar in this pic because that's what I had close at hand.
I hope this helps your plans, and let us know how this all turns out. If you do start out with with something like this, make it better so we can learn from you.
