The model is an interpreting reconstruction of the real building using blueprints and data from my own research!
1:1 scale, highly detailed (BUT NOT EXACT!) reconstruction of the Cologne Cathedral, based on 40 blueprints from the 19th century. I built the cathedral in 2017 (roughly five months) using SketchUp.
The model has a full hierachy of components/instances and layers.
Other file formats (FBX, OBJ,...) are on demand because of the enormous exporting time and file size. This files can reach a size from 6 GB up to 20 GB depending on the level of detail you want.