Maybe I'm wrong, but doesn't the design spec that Musk released describe a very small (on the order of millimeters) clearance between the pods and the tube wall

Maybe I'm wrong, but doesn't the design spec that Musk released describe a very small (on the order of millimeters) clearance between the pods and the tube walls? The 3D-printed mock-up appears to have enough room for almost an entire second pod above the roof of the first pod. Besides the fact that this is an obvious publicity stunt, what's so special about it? Couldn't anyone with a 3D printer, some CAD experience, and a lot of time on their hands have done this just as easily?