35mm film is the original stuff! 😉 And I believe Poita has access to all three, but it costs money to scan prints, hence the need for donations. He can also only do one at a time as far as I know, so right now it’s ANH.
By all means, continue with your project! I know we have the Laserdisc 5.1 audio for all three in the wild, as well as the theatrical DTS audio, but I don’t know that there have been any quality Laserdisc preservations yet.