Hi Neil,
I have been playing with the network method and here's my latest attempt
using your drawing as a start.
I have done some trimming and blending to remove some of the crease lines
not sure if that's the best way but it looks Ok to me.
Have you looked at Zarkow video http://moi3d.com/forum/index.php?webtag=MOI&msg=8845.5
I tried it on the neck network and looked promising.
Cheers
Barry