Probably some thoughts from outside the box....
If you would get your feet wet in the program "temp-lot" : scan or take a picture of your drawing/maps.
Upload it to temp-lot, you could make everything as true to real life in scale as possible.
With all the bits of track (in temp-lot) added to your drawing/photo you can figure out precisely what you need from pico track.
My two cents, i hope this was a bit of help, best Igor
All i would like to have and build is a lot of tracks and live coal steam locomotives....
Currently made ~150 meters of track, 5 3-way switches(need 9 more) and 2 turn outs.
6 double slips crossings, 2 curved crossovers are in the planning to be built. in g scale