I would love to say that I made a very sophisticated automated tool for this.. but it was mostly just me hacking a simple script that lets me manually select coordinates and preview the lines; while console.log()ing the coordinates and copy-and-pasting into the arrays.
The "borders" for each layer are easier -- all the coordinates come from the SVG, after translating and scaling.
The "borders" for each layer are easier -- all the coordinates come from the SVG, after translating and scaling.