To me the most fascinating stability question is seismic. Wind is mostly predictable (apart from unusual events like microbursts). It would be easy enough to st

To me the most fascinating stability question is seismic. Wind is mostly predictable (apart from unusual events like microbursts). It would be easy enough to stack up a storm-stable shape before major predicted storms hit. Seismic stability would need to be considered throughout the stacking / unstacking process. The cylinders have got to go, however. Stable stackable shapes are a thoroughly solved problem (bricks!), and stack at higher densities as well. Scaling up a press release model from the barrels they used for a real life demo saves very little time or money and implies an absence of familiarity with structural engineering, which will be this concept's #1 critical problem.