How long until NSA and China steal those designs, though? Two...maybe three months? I guess whoever builds it will also have the expertise advantage in dealing with those designs, though, which should give them at least a few years of competitive advantage.

Also, my guess is neither of these "traditional" approaches will work to create actual fusion power. My guess is someone else's out of left field approach that will totally shock the scientific community will be the winner.

To realize a complex design like a Stellator they actually also needed to develop a lot of manufacturing expertise, had to build custom machines for making tools and components etc., I doubt anyone would be able to copy that without significant effort.

It's not like stealing a cookie recipe. Pretty much anything that has even a little bit of complexity can't be "stolen" just by having a blueprint.