Thanks for the feedback! I imagined the structure as a stepped pyramid of three levels of square rooms that get smaller as you go up, with a single giant support pillar in the center of each level carved to look like a dragon standing on the ground with its head poking into the top level. There's an unlabeled (oops) sketch of the exterior of the ziggurat building on the last page, but I definitely think there could stand to be a single page or a spread or something that shows how the three levels connect via traversals and the pillar.
Thanks again for your helpful critique and your charitable assessment of what does work!