I should clarify ... the projects are all okay, but the moment you start to distribute copyrighted material in amounts greater than permitted by fair use, you're opening yourself up to trouble. Even derivative works, like the splitscreen edition, go beyond fair use. The Backstroke subtitle set is an interesting case, though; it's a derivative work, but due to its abysmal quality it could almost be a parody ... and I doubt the actual copyright holder to that translation would come forward to claim damages!

Edit:

On the subject of workprints, Wikipedia says something created before 1978 but published before 2002 has Federal copyright protection until 2047. If George was serious about his movies being "workprints," then Star Wars (not ANH!) will enter public domain in 2047. I'm sure the ANH crawl can be claimed as fair use, or recreated as a deriviative of the 1977 crawl, and used to reconstruct the ANH crawl by interested parties.

There are at least two problems with the above idea are,

a) George can change his mind about the workprint thing any time he wants, and point out that the film was clearly in a final, published form by 1977, and

b) Probably none of us will care by then.