ActionChugger
Now that you have tons of more risers I am sure you are going to be building some more super towers. Take a look at this video and see how they used Tomy R-25 Underground Subway Tunnels zip tied together to bridge wide spans between towers. Very ingenious and looks to be quite sturdy. Can even be used as a base for tracks and bridges above it for more tower to tower trains.
Now that you have tons of more risers I am sure you are going to be building some more super towers. Take a look at this video and see how they used Tomy R-25 Underground Subway Tunnels zip tied together to bridge wide spans between towers. Very ingenious and looks to be quite sturdy. Can even be used as a base for tracks and bridges above it for more tower to tower trains.