The baseboards were designed using the CAD program, after sorting out the track plan. The advantage of using the same program for the design is that you can (as far as possible) avoid having timber underneath point motors etc.
I used 2 "layers" in the program for baseboard designs: one for the main baseboards, and one for the higher level sections. From these designs I was able to print out the design, then do gown the garden and make it without needing any further input.