How to make facade like this picture?

Hi there.
I want to know how to make facade like this picture.

I wat to map to my model this triangle gradational random giometry.
This is giometory diagram.

My model facade is this.

This Surface is inclined,so surface is trapezoid.
And I want to make this surface continuously.

Thank you for reading.
facade model.3dm (69.4 KB)

Oh,thank you so mach!