Every side of the main-mesh-plane has an element with a fixed width (in the example image 6m) and the rest is averaged at the ends (x). This x is changing everytime on every side differently, depending on the side-length of the main-mesh-plane and the size of the elements.
I managed to extrude the main facade elements, but not the corners, where I need not only the edges but also faces to apply geometry to them with the tissue addon.
I appreciate your suggestions and ideas. Thank you for your precious time!