Good start. I'd like to see the offset dimensions, centre to centre mm, between the parallel tracks in the junctions section (and others later). I know they can be worked out from Maerklin documentation even if you don't already have them in your head, but it would be more helpful to show them explicitly in your examples. This will become more necessary when you add configurations for non-standard solutions later.
Maybe you should add a footnote somewhere to explain the 'impact' symbols where Scarm shows that there is not a perfect fit between the pieces, e.g in the last of the junction examples.
Jabez