There are 2 types of gantries in this project; one was for the dome and another for the skylight.
The dome gantry was designed to follow the shape of the aluminium and glass joints. It had a removable handrail but also was equipped with lifeline on the middle of the steps. The gantry pivoted on the center of the dome and moved on a track at the lower end. The movement was manual.
The skylight gantry as straight and fixed in position without handrail but with lifeline.