Helix Construction, Marking out Plywood Supports
Crossing the vertical lines at the correct heights (triple checked!) for each loop. These horizontal lines will be the supports the sub-roadbed sits on. Each support is numbered. Each loop height is marked at the bottom of that column. Look closely, you might see the planned '[' shaped notches in the support to allow wagons to pass without side-swiping the support! Not thoroughly satisfied with this as yet.