Raymer's "Simplified" book has a whole chapter on conic sections, lofting, and flat wrap. Although I understood how to draw a conic section, I could not grasp how to apply that to drawing a fuselage that could be flat wrapped. Today, however, I found this article from the Sept 1990 Sport Aviation. It is written by the guy that created the FLOFT program, which eventually became Loftsman. Unfortunately this program costs almost $300. This document is the user manual for the Loftsman program, and has even more discussion on the method. I need to study it a bit, but I am beginning to see how it all works, and thought that other HBAers that prefer pencil and paper instead of bytes and pixels would find it of interest.