I completely understand the nuts and bolts of this installation, but would appreciate some tips. The 4' wall I will be working on extends out from the house at the bottom of a hill and after 10 feet or so it curves up the hill at a constant radius (the minimum radius the wall can make without cutting...) and then continues another 10 feet or so at that angle (the radius is basically a fillet between the two walls). Since this is on a hill, what is the best method to layout this radius? If it was on level ground, it would be a simple metal post at the center with string etc.. but since the ground at the center of this curve is 4 feet higher than the base course, how should I measure out this curve? I considered making a template from a large piece of cardboard. or....suspending a level measuring tape and hanging a plumb bob? Thanks!