dividing a list

Hello all,

I have a question regarding tree structures and how to possibly divide lists:
Attached is a definition that I am working on.  The basic logic is that several surfaces of different dimensions want to be divided based on their particular sizes.  Dividing them with a point grid proved relatively easy, but then I'd like to connect those points to create a grid of lines that corresponds to the size and dimension of each surface.  The lines are easy to form in the y axis, but I think I need to restructure the tree to get clean lines in the x. 

This basically amounts to dividing a list that is currently 36 paths, and grouping these paths into 5 groups, 5 paths.  This seems like it should be possible, as each group is numerically clear when you look at the tree structure, but I can't seem to get it to work. 

For a little background as to why this is important for me: the surfaces that I am dividing are based on the makeup of a particular urban block, in this case one in Baltimore MD, but I'd like this definition to be applicable to any block, so that one could reference in the geometries that make up that block, however many different plots there are, and these would be divided accordingly. 

I've attached the definition, the Rhino file with the base geometries, and a screenshot of the data structure that I hope to reorganize.