Mysteries continue to emerge from the fog of history. Here’s a concept image that turned up in an online auction in January 2022. It’s never been seen before and resembles nothing in the finished animation.
Handwritten text reads, “Reunion with Yamato -Part 2- It sat like a temple in the green corridor.” The art is dated 1992 and signed by Ryo Katayama (though the signature is unconfirmed).