One of the ideas of this project is, to NOT use concrete, to not have CO2 emmisions. And depending on the "skill" of the robot and its algorithms, it could be

One of the ideas of this project is, to NOT use concrete, to not have CO2 emmisions. And depending on the "skill" of the robot and its algorithms, it could be very stable. I know that quite some ancient buildings in south america are put together just with stones put together(with precision and shaping of stones). They survived earthquakes and are still standing. So if enough stones of various shapes are avaiable - you won't need concrete. The weight and friction will hold them together.