Source: https://en.wikipedia.org/wiki/ShatterzoneWikipedia wrote:The Shatterzone universe shares much in common with the Star Wars role-playing game produced by the same company and was a repository for original ideas produced for Star Wars but which were turned down by the legal department of Lucasfilm. As such, the universe of Shatterzone shares some structural similarities to the Star Wars expanded universe including an intergalactic government called the Consortium (like the Republic from Star Wars) run from a central region of space known as the Core Worlds, large megacorps that run galactic affairs (a theme common in the cyberpunk genre of storytelling), and a super-industrialized capital world, called Centaurus but similar to Star Wars' Coruscant. Likewise, there is a sentiment of xenophobia in the setting similar to that of the Empire in Star Wars. Humans, Glahns, and Ishantras, the three ruling races of the Consortium and a few others are given full citizen status while other races suffer under prejudice and second-class-citizenship.
According to the article above, the Shatterzone game line was a repository for ideas (perhaps also modules, sourcebooks etc?) that were turned down by Lucasfilm. It should be noted that former president of West End Games Scott Palter, denied this to me on Facebook a few years ago.
However, has anyone thought about using Shatterzone material for Star Wars? The RPG is now back in print from Precis Media so the books are fairly easy to get hold of. Conversion to D20, Saga or the current RPG might take alot of work, but D6 conversion guidelines should be available on the web.