I'm with Doom. I have a Star Fox 2 repro as well and I too would like a horizontal oriented cover. I would idealy like the image wiki uses or something similar. If someone is willing to make the cover, I can offer a back box discription.
As for what Doom said, I don't consider reproductions of unreleased games piracy. Like Earthbound Zero, Star Fox 2 was only a beta. It took homebrew devolopers and translators to arrive at the final build of the rom, and the fee that those who make reproductions is mostly used to just cover cost of materials. It's also extremely unlikely that Star Fox 2 will ever appear on the Wii VC. Nintendo abandoned the project in mid 1995. I don't see them comming back.