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Fat bolt designs are usually multi-lug, which would IMHO involve even more complex breech work than necessary for the Mauser 98 action. Even if the bolt locks into the barrel or barrel extension, I assume you (Jason) will want to produce a shootable product, not just an action, so if your bolt locks into the barrel, you will have to design and make the barrel breech as well.
The small ring Mausers were made for cartridges in the 40-45k psi range. They have been used for rounds exceeding that, but usually are not recommended for rounds in the 60k range like the .308. Of course, that is assuming an old action with early 1890's metallurgy, so it would not apply to a new action made from modern steel alloy. Still, the 98 action has features, such as the way it handles gas escape, that the early actions don't have, and an exact copy wouldn't either.
I am not very familiar with EDM, though I know generally how it works. But it seems to me to be a fairly expensive setup.
Jim
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