how do i create a 3d pattern object that can be united and baked as one?

Hi there,

I'm trying to create a single object out of a number of overlapping patterns of boxes. I'm not sure how to modify the boxes (made with box component) to turn them into objects that i can boolean union so it removes the overlaping surfaces. I understand that when baked, the created surfaces need to be exploded and joined to create a 3d surface in rhino what do i do in grasshopper to not have to boolean union 2 million boxes individually in rhino?