Creating Random distance of grid

Hi

I am trying to create different size of horizontal mullion with randomised distance of grid as below image. Rajaa Issa helped me a lot to create this geometry.

However, I am struggling to make multiple distance between different mullions.
Could you give me any idea for that?
Here are my model.
Test5_Simplified.gh (28.4 KB)
Test5_Simplified.3dm (114.8 KB)