Sweet sweet sugarworks

It was the beginning of April when a friend of mine asked me to prepare a cake for an event he was organizing. As an art historian he is involved, with some of his colleagues, in trying to save the local concert hall the Beethovenhalle; there are in fact plans of building a new one on the same location.
The first plan was to bake a cake in the shape of the building itself so I started collecting pictures to build a 3D model of the cake and plan this way the baking. The building itself isn’t really articulated but it has different parts at various roof heights plus a nice fancy-shaped dome above where the actual concert hall is located in it.