My Phd project was very nearly a Farnsworth fusor. This is a public forum so I can't really say any more, other than we've been able to see ~30 seconds of self-sustaining reaction. We think.
Impressive that the kid can do it at 14, but not a horribly complex project, especially considering plans are readily available. Now, show me a 14 year old who can do near-field microscopy, and I will be impressed. What makes me happy is to see a young American kid with some enthusiasm for science. That is a rarity these days.