A closeup of Support #1, showing the space for the approach ramp.
Cut out each support, taking care to always stay on the outside of the pencil line, to ensure that all supports are consistent (so they're all...
Using the NMRA gauge to show the problem with a 1" wide spiral helix. In particular note how the left side of the gauge sits atop the line...
Crossing the vertical lines at the correct heights (triple checked!) for each loop. These horizontal lines will be the supports the sub-roadbed...
Transferring 26mm wide vertical lines to the wooden supports. Each loop gains 26mm in radius as it winds around the helix.
Placing the cardboard supports on the wooden strips, shuffling them around to use the minimum material while leaving room for sawing around them.