I had a change in my plan from point to point to continous run and decided to span the gap with 2 single track through truss bridges. Using the Robin technique....see Robin you have taught me alot....I built both spans out of congrugated(?) cardboard. I must admit seeing the final pictures, this was a good choice of materials. Still have to add the walkways and handrails, which will be built of cardstock with window screen glued on top and the handrails will be also window screen. Additional pictures and it's final completion on the module will follow shortly.