On my many many visits to the Izumo shrine, it was easy to imagine what it would've been like back then because really, it hasn't changed much, other than its height off the ground. The theory that it once stood 40 meters high was reinforced when the remains of huge posts were found buried at the site. So, on the Other Side where the Gatekeeper's guard the gods, I made the shrine in the style it was once believed to be. That was, and is, a fun part of creating Shoko's world.
Model of Izumo as it may have once looked
A Miko (Shrine maiden) kneeling near the remains of huge posts