moving a measuring vehicle within an area in which a packaging plant is to be erected or modified;

providing stationary position detection devices, which can communicate with the measuring vehicle;

detecting a position of the measuring vehicle relative to the area by the stationary position detection devices, wherein the measuring vehicle is positioned at a plurality of positions within the area, wherein the measuring vehicle predetermines exact fixed points if required or marks them on a building floor, and these points then serve as precise reference points, and wherein the measuring vehicle marks permanently or removably machine outlines, coloured resting surfaces or reference points for the installation in advance in the area, wherein these position detection devices themselves also have image capturing devices which record three-dimensional images of the area, wherein the positions of these image capturing devices form further reference points for the creation of a three-dimensional model of the area and of a plant part to be arranged in this area;

recording at this position respective images and/or data of the area with a first image capturing device of the measuring vehicle and recording images and/or data of the area with the image capturing devices of the stationary position detection devices, wherein at least one geometric property of the area and/or the packaging plant is detected; and

creating the three-dimensional model of the area and of a plant part to be arranged in this area on the basis of the data and/or images recorded by the first image capturing device of the measuring vehicle and by the image capturing devices of the stationary position detection devices, wherein a model of the packaging plant to be built or modified is taken into account for designing of the plant.