I have built a couple "authentic" Ringmasters using my own ultra-light construction. No external changes, so still OTS-legal.
The last one weighed 17 oz. with an OS 15. The construction did not survive maneuvers. After attaching the outboard wing (again!), it was 19 oz.
While the typical Ring will weigh 25+ oz. and fly quite well, getting weight closer to 20 oz. makes a large difference in the plane's response, especially in corners. The light weight allows use of the smaller engine.
My plans for Ring-Lite have been offered here on this site, and I have sent many. I again offer plans and for free.