I have finally started to mod my KSP and decided I I like the enhancements so much I should try my own. A picture is worth a 1000 words, so you can see where I am going from the attached. I tried out DarkSideTechnology mod and was generally pleased with it, but wanted to get a complete ring. The inflatable ones just don't look impressive to my taste.
What you see in the image is: a folded/deployed 10m ring w/ 2.5m core (will fit in a 3.75m fairing), a folded/deployed 15m ring w/ 3.75m core,