gradient bricks wall

Good morning, 

I'm trying to develop the facade as the one in the attached render. Basically it's a grid made of bricks in which the the density of the grids ais decrescent as ina gradient. Looking at a similar example made by points and not by volumes i tried to develop the project but I'm not able to link the grid with the grids to the random reduction panels connected to a beziers graph (which is the one which provokes that kind of effect). Really hope that you could look into this matter and help me! Thanks in advance!!