If you need conversion for measurements, a search engine will bring up plenty of conversion pages 😏
Here is the track plan for Millwood using Hornby/Tillig track:
And here is one I was working on for the next layout, before I decided to change scales. This is with Peco track, but as SCARM does not yet have the peco x-overs in its library, i temporarily used the Hornby ones for the plan.
The Purple track would have been hidden incline and declines (1.9%), allowing the branch line a short airing on the upper level and access to and from the mainline.
The black is a single track base level branch line with shunting able to be done without entering the branch line itself, the blue is the upper level dual main line, and the green is the upper level part of the branch line and shared access to the turntable.