The drawing tool in Urban allows to draw right angles, which is a good thing. But there is no feedback on the length of an edge. If you want us to use Urban also to sketch building footprints, we need to have the option to type in the length of the edge (similar to the CityEngine drawing tool). Otherwise we will need to sketch building footprints in another Software (CAD, CityEngine etc.) and then import into Urban. But this approach is more cumbersome and will not allow to change designs quickly during workshops as it needs much more time.