Add disk shelf to ZS3-4

Hi Experts,

I have this configuration:

1.- ZS3-4 Cluster

2.- 2 hba per head to interconnect disk shelves

3.- 4 disk shelf DE2-24P with 20 disk of 900Gb

4.- 2 Pools one each head on RAID Z2

I have the plan to add 1 disk shelf to grow storage, but

Maybe add 1 disk shelf DE2-24C or DE3-24C with 20 disks of 8TB

My questions are:

Where I can find the diagram for the interconnection of 5 disk shelves?

Is possible to interconnect 5 disks shelves with 2 HBAs?

Because in the documentation "http://docs.oracle.com/cd/E79446_01/pdf/E79456.pdf " I don´t find anything