Steve did this for the Jack Kirby Collector. They plan to publish it as a cover, but have not yet done so. Steve inked Galactus in place of Therman Man on a separate piece of Bristol (shown). Then he copied and pasted everything together, inking where needed.
So what you are getting is the and the pasted together cover.
We are including:
The original art inked partial figure of Galactus done in India Ink on Bristol Size: 11½" x 17½"
The pasted together new cover on DC Comic board Size: 12" x 17"
The original cover is shown for reference only. It is not included.