network command nuances

 From:  Stav (STAVROS)
6427.1 
Can someone PLEASE tell me how to build this ring from a network.
It a simple shape but I just cant get the network command working.
There must be some nuances about how curves connect because I get alot of failures.
I ended up building this in a roundabout way using cuts and lofts and blends but I need more control and the only way I can think of is to network outlines.
Any suggestions would be appreciated
Ive included a sample file
ps- disregard the wave in the middle of the band..its actually a split ring(i know how to split it) but I need the whole general shape

EDITED: 2 Mar 2015 by STAVROS