Simonstrocity

ok um.. im a total $%&^! so maybe these lots/bats/whatever already excist, there appear to be hundreds of them. 1) diagonal streets 2) roundabouts from very large to small, size can vary 3) dikes , sort of like elevated roads (elevated by ground)

If i download a different looking train, car, boat or airplane, will every train/plain/car look the same in the game? And can i put in different kind of tree's somehow while still haveing the god-capability's you have when creating a region