The taller bridge will probably be an open arch bridge (it's awfully hard to
make one out of Styrofoam) which will give you a better view of the lower inner
bridge which may be a wooden type of bridge.
The river bed will be at the edge of the section frame, we intend to
use two inches of construction foam to create the ground level, and the track
will be mounted on plywood sub-roadbed on wooden risers for strength and
stability. From the top of the mountain to the bottom of the river will be over
16 inches.
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