It's intrigued that the section model and epic drawing (in book 1) are all based on the same narrative I wrote about theater. But it is obvious those two objects convey totally different messages. Epic Drawing is about inner space, the one shows in the drawing, even though leftover space may catch people's eyes. But this section model is much more straightforward. It implies that unbuilt (outer) space is as important as the one that has been built (inner), if not more critical.
By drawing on the model, I combined 2D tool and 3D tool together. I wrapped the 3D model with 0.5" width strips. The image above is made by the unwrapped stripes.
Zoom in to a small portion of whole image. Creases turned parallel stripes into circulation space.