Hi there!
I use G and T cannon levels http://starwars.wikia.com/wiki/Canon as 100% true, but I use to consider other cannon levels if they just fit in my stories. In other sessions I use other non-official/non-cannon like other stories like Megaman X saga or Chrono Trigger/Cross worlds.
My main idea its "just have fun" and try to maintain a minimal respect to SW Universe, only about 10-20% of the entire SW galaxy has been discovered so, put some extra worlds there ![]()
I addapted those worlds to the Force, SW technology and the effects seems awesome to my players. They didn't broke SW world.
Just try and experiment with your favourite worlds ![]()
Take care!