I wish I'd seen it. You took a tour of the old DC offices?
It still looks like a printed version. It looks like a paper-fold going through the Demon, Captain Marvel and Guy Gardner. With a lesser crease through Amethyst to the right of them.
And another paper-fold through Blackhawk and surrounding characters on the other side.
No, I've never been. But that image has been passed around quite a lot. Somewhere there's even a full listing of the artists.