Best advice: use your own ideas for making a game.  Star Wars has got to be the single worst universe to make a game in (trust me, this is my second time doing this so I speak from experience).  We can't sell our product, we have trouble even advertising our product, and if Lucas wanted to he could easily just shut down the operation tomorrow. 

The only legal proceeding that took place was we were required to turn over all copyright, once finished, to LucasArts.  The agreement stems from some of our previous works and also an open "Fan Fiction" creation agreement put out by LucasArts themselves via LucasFiles.com.  This means that this mod is effectively LA property (though they claim no warranty nor liability for these works) and should they pick up the copyright they could even reproduce our works without paying us one red cent.  We also had to agree not to use any specific trademark terms (like "lightsaber" or "han solo") nor could we use any characters from the movies

So as I said, use your own ideas.  Not only are you legally protected from theft, but you can do so much more with them.  In this pokey universe we're forced to make blasters a certain way. We have to make the aircraft fly in a particular fashion.  We aren't allowed to add lots of new things nor can we change any of the existing stuff because then it wouldn't be star-wars.  And because we're so restricted and locked in development has been both difficulty and saddening at times.

Fear the Woodzilla