Multiple Surface Extrude

Hi!!

Im working with a model based on repetition of tiny cubes. I want to extrude row of cubes to both sides. I did a surface split against a grid (curves) resulting with many tiny surfaces, which I have to extrude. I could never do the extrude because after the surface split my gh crashes. Is there a way to extrude the surfaces as tiny cubes but in a way that I can manage the file? 

In the file Model the layer Input contains the grid against which I split my surface. In the layer extrude I put the tiny surfaces (resulting from the split) and the cube (after the extrusion). Im attaching the gh file I´m working with, as well. 

Thank you very much!

Sofia