Making Swords Without Master into Star Wars requires basically no work at all. Star Wars is already swords and sorcery with spaceships, so using a swords and sorcery focused system works just fine.
I'm running a space opera game using Swords Without Master right now, and it works really well. Initially, I didn't really change anything except to rename things to sound science fiction-y instead of Conan-like. So your eidolon is now your simulacrum, Naming is called "adding it to your Orbit" etc.
After playing for a bit, the players didn't like how the Perilous phase worked, so we scrapped it and replaced it with the conflict rules from Misspent Youth and that is great. but I think they'd have been unhappy with the Perilous phase regardless of what genre we were playing in.