A gaming idea. Probably not the first to suggest this, but...
How to run a Star Wars game with OD&D, BX, BECMI or Labyrinth Lord.
Jedi = Cleric
Sith = Elf
Droid = Thief
everyone else = Fighter
Species is more or less irrelevant. A Star Wars human is roughly the same as a Rhodian or Zabrak or Mon Calamari.
However, for especially tough, strong or large aliens like Wookiees or Gamoreans, use the Dwarf class (unless a jedi or sith). Likewise, for small species like Jawas or Ewoks, use the Halfling class.
lightsaber = 1d10 dmg
blaster pistol = 1d6 dmg
blaster rifle = 1d8 dmg
Wing everything else.