Garden Slabs

I am trying to figure out the garden slabs. At the moment they are the diagonal connections accross the site and they also fiunction as the fabric that connects all the different parts of the site their form is derived from the from the connection between the exterior points of the site which are based on the 50x50 grid. I have started to model the private part or the building because it is smaller and more manageable to test if this method is working.

In this screen all the garden is at the same level that will change.

The red areas are single height slab.  The pink is double hight slab. The the radial lines are the main circulation towards the centre of the site.

I would propose that I model it with the main program as large chunks which I can then pull out and model individually with more detail. what do you think? Other wise it becomes to complex and I get stuck??