I decided to go for the scooped neck version to begin with, and true to the billing I was able to cut the fabric out in the amount of time it took my 3 year old to notice I was doing something else vaguely interesting while she was watching Dora the Explorer.
The sewing was simple too - easily completed in one evening, and best of all... I really do like the result. The bust darts are super low and long - they start at about waist height and go up sharply towards the bust apex. This gives that distinctive boxy shape of the mid 60s but with just the right amount of flattering shaping. I used some vintage lightweight fabric that was donated to me years ago by a teacher who'd discovered a sizable stash in an old school cupboard. Next tie I might try something with slightly more drape, but all in all - thumbs up to the Extra Quick 'N Easy. Lemon squeezy.