I've been reading up on Green Lantern, and it depends on the ring wearer. One of them just made beams and bubbles (a bubble with functional air that allowed for space travel, but still a bubble). Others have made working vehicles, comicly huge guns, and kryptonite. As for the sidebar, that would be cool, but either works. Shaen mentioned a feat I missed. Innate is what I want, not Permanent. So what I have now is:
Create Object 3 (Extra: Duration/Continuous; Flaw: Range/Touch; Power Feats: Precise, Subtle, Innate, Progression)
This allows me to make three 10x10x10 cubes (with 15 or 45 points of features if the refs allow)