A spline curve in Rhino can be constructed and modified by using either a control point curve or an interpolated points curve (edit points). They both result in a spline curve (nurbs).
The 2nd picture you posted looks excellent; very simple where it needs to be and more detail where you need it. If that isn't your work and you are trying to replicate it, they have given you the answers on where the control points need to be placed You can simply make a curve by clicking on the curve in the background image in the appoximate area of the control points shown with the same starting and ending points. Use a pointsOn command to show the control points and drag them to make your curve match the background with the points in the areas shown. The flat area on top for the neck interface would be a straight line. There would also be an angled line following the FB profile at the top of the blue curve that needs to be accurately placed first, then you can do another control point curve to trace the cutaway. The red one is either another tracing or maybe a blendcrv that's been rebuilt/tweaked. You need to check the geometric continuity of your seams and use the match command. If this all sounds like gibberish you should spend some time with the manuals and tutorials on the red cd first then it will make more sense.