Hello,
Looking at this a bit I think I would use the existing plans petal edges, determine the depth of the petal at a few places and then make sure I started the petal closer to the front center of the bottle and Sweep the curve past the outside of the front center bottle edge. I'd then use Sweep to get the actual surfaces.This would get me the cutter stamp of the bottle. The last operations would be the easier ones (on second thought, everything looks difficult on this model), I think the XO bottle doesn't actually have a scalloped center, it just looks that way because the (chamfered?) ellipse is Booleaned from the inside of the bottle. The same on the outside, that is why it would be important to actually send the petal surfaces past the edge of the bottle, I don't think the outside profile is actually straight, it looks like you would need to develop a second curve set to Merge and make the solid. You'd be left with some hard edges which would require some filleting work. The bottle looks symmetrical, so you can Mirror the item. It's almost as if you could create the petals as an object to Boolean, then create the bottle and cut that petal stamp away from the bottle. Either way there is nothing simple about the project. Another option is to have a bottle scanned and then use that for the surfacing reference for something like Autodesk Shape Modeling or Tsplines.
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