Using Adobe Illustrator I drew up a track diagram including key features and sizes.
I will soon add an extra layer to this drawing to include the wiring configuration and turnout numbers (electric points)

This will be used to create a control panel in the future.

I have tried to keep to the Australian T Trak standard when it came to laying out the Kato Unitrack. This allows other modules in the future to connect to Culcairn.

Note Culcairn obviously doesn't have a balloon loop at one end and a fiddle yard at the other. These were added to make the layout ready for exhibitions.