So, the suggestions above don't give you a good way to do it? I can see if the points are not enough for a good mesh, it is probably no use to place each on in SU 3d. For that matter a CAD app might be easier to layout the contours with. Good luck. We would like to see how this process develops--although I usually start with contours from a Civil myself (new stuff has to be made up on top of that).