When one embarks on a project such as this you need some serious equipment to get the job done. This "giant" crane is used to lift the the trusses into place. To get an idea of its size, look at the guy standing at the base of the crane. Yesterday's picture of the stadium shows the crane towering over the structure.
There is a great deal of activity as the construction team prepare to put the next truss in place. From my observations it seems to take about a week to put one up. The crane truck is dwarfed by the crane.