I wish that I could specify how long line segments are and be able to "lock" the lengths. That way when I move a vertex it will pull the other vertices to maintain the lengths specified and maintain the endpoint locations. Similar to that of a string, you have the overall length but I need to figure out where the bends are. I work with water and sewer and sometimes it is hard to pin down the location of some things because of how it was inspected back in the 70s. I have an overall length of the lateral from curb box to building but there are three bends in between, without angles.