FF6 Museum Help!

What do you already have though?  I'd prefer to avoid reinventing the wheel here by digging up stuff that you've already found.

I update my first post with the relevant stuff I found on my hard drives (see bottom spoiler tag).

Have you thought of asking the World of Balance Facebook group?  They do seem to like their art though, so I'd be worried that you might get inundated with Tumblr/Deviant Art stuff like you mentioned might happen in your footnote.

 
That is a good idea. Do you think they will get offended if I link this thread and they see the footnote?

More seriously, how could I ask diplomatically "Awesome and unique art accepted but no average DevianArt images!" ?

I'm not sure unofficial walkthroughs are worth putting in the museum.  From what I've seen, a lot of them are pretty bad.  I'd be surprised if there were any real number of decent unofficial walkthroughs that aren't copyrighted and are obscure enough to be worth archiving.

This is mainly for archival purpose rather than consulting a guide to play the game. In any case like you mentionned, I can't tell if I break copyright law for each PDF Guide due to them being not printed anymore and with their age (if those are elements to consider or if it has no inpact on how the law is interpreted). And no there is no worthy unnoficial guide except some text walkthrough hosted on GameFAQ, but that's not really what we are talking about here.

Again, thanks for the link sent via pm!