Adrian, that is all well and good, but as described, such is only an exercise of a series of stick lines and geometry, no more complicated than a game of checkers.
No matter what, you must have info on specific topo, subsurface survey of soil and rock, perc, and an available water assessment, and drainage of outlying area of property as well. The whole real function of routing is to assess all these other factors and still make the route work, golf wise. Without the factor, it is a paper exercise.