I don't know what specific boat you are modelling, but if the life-lines are (in the prototype) actually rope or nylon, then there should be a slight caternary (downward curve) in between each set of stanchions. Or, if the proto has tight lines, then there would be a half-hitch or some type of securing done with the line around each stanchion. At least, that's the way I have seen them on real boats