where the aircraft is generated by eyeballing the placement of the spline curves and matching it with the design pictures. This does not seem to be a good way of generating an accurate surfaces that can then be prototyped and machined. Is there a better way to design an aircraft in solidworks? I would imagine that there is a better way go about this for a real aircraft that is intended to be CAD-designed and then built. Perhaps some aerospace engineers have some experience with this?
At the least i'd suggest using style splines instead of the standard splines the guy in the video is using. You'll get a better quality of curvature.
Outside of that, SolidWorks has a tool called Auto Trace that might give you a better result for the technique. I'd also suggest getting as many dimensions on the spline as you can, that'd compensate for the slight inaccuracies of doing it by hand.