Pattern Drafting Hints:
My favorite seller for swimwear fabric: lycra4sale
Once the cups were separated I was able to draw around one to create a pattern that was similar in shape to the original Lutterloh pattern.
You'll see from the photo above that I needed to cut the pattern from the bottom to nearly the edge of the top so I could spread the paper and add some width for gathering. The lining pattern is spread just a little less to fit better inside the concave curve of the cups.
The lining, fashion fabric and the contrast binding were all sewn directly over the side edges of the bra cups to avoid bunching inside. I left the bottom of the cups free from the gathered edge so the elastic bottom band could stretch as needed.
If you'd like to try sewing swimwear I would highly recommend either or both of these two books.