If your gonna build a prototype route I would suggest getting RWDecal (
http://www.rwdecal.co.uk/) to aid in the trackwork/building placement. It allows you to make decals from Google Earth and import them into Railworks, then all you have to do is follow the tracks on the decal.
But anyhoo, it looks like you will have to modify the yard ladder tutorial a bit.. The west end of the yard looks like it's a simple
Y turnout followed by yard ladders on both sides. The East end is a bit more complicated (I took the coordinates from your screenshot):
http://i.imgur.com/rItpQ.jpgBut it can be done in Railworks without to much of a problem...