I modeled a lot of airplanes with the old Rhino beta back in the '90s. I always used the 2-Rail Sweep instead of Network. The guide rail option in MoI is a big help because it makes it a 3-Rail Sweep. For the type of plane you're modeling, I'd break it up into front half and back half. I made a copy of the hilited curve (in yellow) and used the copy to model the taller X-section curve at teh same location. You can cut out the cockpit area by going into side view, drawing a curve, and projecting it to the surface.






Steve S