Yup, wouldn't want to load the pipe. Then extend that last section of boom you haven't used and have it come crashing down.
An other thought here. Looks like the higher level would be main floor elevation. Then the lower level will be the base for the plaza, upon which sand/gravel will be placed and paving stones (granite pads, whatever they're putting down) on top.
This image shows cast in place concrete and granite.