Hi,
I had a requirement to be able to sequentially re-mark my precast concrete wall elements based on their location.
I also had calls to use this script on Door and Window elements. It allows you to specify the prefix for the mark (P for panels, D for Doors, W for Windows) then the number to start amending from as the suffix (start at 0 or 45 or something else) and then which direction (vector) to sequence elements in (N/S S/N E/W W/E) This is a Dynamo player script, and has been written to have no dependencies. It might give you some idea of where to start and then you can start sorting with your Z axis requirements also. Hope this helps 
(DP1.2) Renumber Element Mark Values by Location.dyn (56.5 KB)
EDIT: Refer here for Spiral Sorting of Elements around a central point.
https://forum.dynamobim.com/t/spiral-like-numbering/13497/2?u=ewan_opie