PANELIZING/STRUCTURAL LINES FOR TRIMMED SURFACE

hi

I have been trying to take a trimmed surface and figure out a way to generate curves along its surface for structural lines and panelization. I am having alot of difficulty - the surface is trimmed in a few places. I am wondering if I need to approach this in a completely different way avoiding trimmed surfaces - I am not sure how I would generate the surface in that scenario... - and try to produce a surface from the original structural lines instead of the other way around.

I presume that this is something more advanced users know all about and can save me the headache of trying to do the impossible. Any advice?

thanks so much