Measuring all the relevant info concerning this drawing

ECRAN LED 2 .skp (2.0 MB)
Hi there, I was asked to measure the curving of this wall, but it seems to be more complicated than I thought. Can someone explain me how to do this?
For your information: this represents a led wall built from 500x500mm modules. These are individually ‘bendable’. i would need to know what the curvature is over the entire length so that i could bend the led tiles in reality.

Make a copy. Explode all. Select the lower lines and see the length