You are right, it’s ahead of the bolt face. As I literally every other action made. It would be impossible for it to grab onto a case rim if it wasnt at least in front of the rim.It looks like the extractor sits in front of the bolt face. If that is the case then in addition to the cone breech a notch will have to be cut for the extractor to fit in like the model 70 or 1903 Springfield. Criterion makes prefits for 03's maybe they'll make one for the CDG.
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What you fail to see is that the extractor is clearly flush with the bolt nose. Look from the top to past the ejector slot.