Walk a path
Three paths. Each is a line of short steps, ordered so that an idea arrives after the things it needs.
One station is open so far, the seventh on the first path. The rest of the map is drawn here anyway, with a count of the stations mapped behind each heading, so you can see where the road runs before any of it is written.
You do not have to start at the top.
Ground to Stand On
What everything else rests on, taken in the order it can be carried. Five stretches, 32 stations.
The Hard Questions
The questions people actually carry in at eleven at night. Where the Church has published its own essay, the ramp walks up to it and hands you over. Nine ramps, 53 stations.
The Story in Order
Two centuries walked once, front to back, so that no single fact has to arrive on its own. Eight periods, 49 stations.
Every station names what it assumes and links back to whatever it assumes, so nothing arrives before the ground under it. A few stations are gated: they stay closed until the earlier ones are in hand, because delivered on their own they do more harm than good.
Where the Church has published its own essay on a subject, the station walks up to that essay and hands you over. Those essays already exist in the Church's main languages, which is why the map is hung on them. What Emmaus writes is the walk-up and the shelf behind it.