I will agree that an exact profile at bending is going to be difficult to maintain but you can get it close. I profile all my side before bending , it save so much work at the end. The radius will determine the final shape of the side in the mold. At that is the key , as the side shape sets in the mold the radius if the back will determine the points along that shape . So a side profile of a 000 once complete is slightly different than a 00.
I was trained at Martin and I pretty much use the same system they use, rough in the shape the detail it with the concave dishes.
As long as the end result is what you need, you can do it other way as well.
https://www.youtube.com/watch?v=LrgRKKsxL-M
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John Hall
Blues Creek Guitars Inc
Authorized CF Martin Repair Center
president of Association of Stringed Instrument Artisans
http://www.bluescreekguitars.com