Reddit mentions of Star Wars: The Blueprints

The blueprints are definitely not original. They didn't write in block letters like Hard Data Input and Access Panels like that.

You'll find unaltered reprints of the blueprints in this book:
https://www.amazon.com/Star-Wars-Blueprints-J-Rinzler/dp/1611097967

If they were truly the original ones, they wouldn't have been able to make these books or they would have been working from copies of copies or something. This book is photographs of the actual drawings. In some of them you can see the creases and paper folds.

My understanding of the slides is that they are 35mm film cells that were created as reference materials for merchandisers or used for print material in magazines and stuff. It's unlikely actual production used stuff will have something like a copyright like that on it. Revenge of the Jedi had it's title changed pretty late in the process so these slides would have been made before the change. WHich fits into the idea of promo materials since that will happen well before release.

The rest look like photos of matte paintings during production, or photos of photos of matte paintings.

There be a book, matey. Otherwise, to Google images.

If that interests you, you might want to look into the "Star Wars The Blueprints" book.

http://www.amazon.com/Star-Wars-Blueprints-J-Rinzler/dp/1611097967

I can't be bothered to lean over and grab it off my bookshelf to see if there's an R2 drawing in it, but it's full of actual drawings that set pieces were made from. I originally though it would be fictional "this is a schematic of the Millennium Falcon" blueprints, but they are the working drawings from the studios.