I don't think Rocks looks much th same on page 17 as on page 3...is that partly an artifact of the original artists as well as the modern artists?
Well, page 3 and page 17 are both by modern artists. As is is the close-up of him on page 6. No original artists here at all.
The only original art with Rocks is a small appearance on page 5; three panels on page 13; the forthcoming page 20; and a small appearance on page 21.
The way Rocks looked on pages 3 and 6 is how he looks when Bob Rivard inks Angel's pencils.
Here on 17, it's Shane inking Shane's pencils, so it's possible that Rocks looks different.
That's what happens when there are different artists drawing the same character. It's also possible that Shane may have been trying to fuse Angel and Bob's version of Rocks with how he appeared in the original art for the Shuster Studio pages, but that's speculation on my part.
Back when it was just Angel and Bob handling the art chores, and I was considering adding additional artists to the project, I was concerned about having so many different creators in the soup. I thought that their differences in styles might be a problem, because I wanted to stay faithful to what I thought was a consistent "Joe Shuster" art style in the comic.
But after
Bob Hughes explained that there were already different artists who had worked on all the pages back in 1940, that a lot of those pages were in completely different styles from each other, and that
none of them was actually done by Joe Shuster - I figured we were only continuing the time-honored Shuster Studio Method and thus being true to the piece.