Today, the modern world of optimisation software and 3D printing clashed with the traditional world of typical construction engineering. The engineering software used to address the various functional and safety requirements could not handle our complex geometry. Additionally, there remained many unknowns yet to be taken into account; amongst other factors, it was unclear how much stress the medieval canal walls could withstand and it also turned out to be near-impossible to define the material properties of the printed geometries. This means we have to start all over again… Basically, we need to reduce complexity and avoid tension stresses as much as possible. Let’s hope we can make this happen quickly!