This is a timely post since just yesterday I bought some nylon rope and pvc pipe to make my own ring setup at home. There’s a post in the equipment section of the crossfit.com message board that shows a very nice looking set of homemade rings. What the guy had done was take two lengths of pvc (looked to be about 1 1/4″ or more in diameter – I’m not sure what the diameter of real rings are) and heated them in the oven on a foil-lined baking sheet. Then removed the pipe (while wearing gloves) and bent them around a paint can. After they hardened he wrapped them with grip tape and hung them up. They looked like a pretty good replacement for store bought rings.
And congrats on the near-muscle up. That’s one of my long-term goals.