sounds must be identical to the original star wars but remade from scratch ?
since this is open game, in legal terms you probably are limited to using non-commercial software, that's pretty bad news because all the good stuff I got is all cubase and wavelab VST's hundreds of them
(like Waves)
maybe if my system goes online this week I will see what I got (already produced) that might fit you and see if it's legal because I don't really remember what softwares I used to produce some of the already complete works (which are not yet used anywhere) but that is not star wars original sounds, that will require a complete new approach, going from synthesis based to sampling based - and I have no idea how lucas sampled all his sounds (given that we all know that lucas produces all his sounds by himself and does not use sample libraries).
I wonder what kind of effect non-original star wars sounds might have on this project