okay, i know this should be super simple and i am probably missing something. I am trying to creat sidewalks along a road with curb and gutter. the sidewalk begins at the back of curb and extends all the way to the ROW which is not always the same offset. The cross slope of the sidewalk needs to be a minimum of .5% and a maximum of 2%, and should meet existing grade as close as possible. I in the case where these grades cannot be acheived, a mortar stacked rock wall can be used with a 1:1 slope and the toe of thwe wall being at the ROW. What is the simplest assembly to build to achieve this?