Nahhhh, just deleted that one surface and used your curves that were already there. Network surface is a cool tool, it will effectively take intersecting points on curves and attempt to fill the outlined area. If you are playing with version 3 beta, there is now an added 5th curve which can be used to excellent effect on car bonnets (hoods) and trunks etc where you can sometimes need that extra curve to bring the height into effect.

Your next problem will be mirroring that bonnet and the sharp seem it will produce, again in v3 beta there is the trim with isocurve option, use that and then blend the two together with a minimal bulge.

Martin Spencer-Ford