This time, I chose a different approach. I'm starting with a different pattern, McCall's M6420, because it tallies the highest on matching Rapunzel's bodice with one pattern: the puffed upper sleeve with the lower fitted sleeve and the waistline that comes to a V. There aren't as many panels, and it uses princess seams instead of an empire waist, but I'm willing to live with that. The only thing I needed to change stylistically was to add the sweetheart neckline in the front and the lower, squared back.
Below are drawings of the alternations I made (for everything BUT the sleeves).
Exhibit #1 - I combined pieces 3 and 4 of the pattern as shown below and drew the sweetheart neckline.
More to follow.