While considering who I was going to install the towers I discovered a potential problem. Once the towers are fixed into place, the lift span cannot be removed for repairs or maintenance. The pulley wheel assembly and gangway, on top of the towers, prohibit the spans’ removal.
Decided to replace one set of fixed lateral bumper rollers for a removable set. Now the span can be removed laterally.
The issues with installing the towers is that the road base needs to be added at the same time. The traffic lights, due to its wiring, needs to be installed while installing the road base. Also, the pulley wires that go through the road base and bridge structure need to be aligned during the assembly. It’s going to be a bit of a jiggle to get it all in place.