I have no idea of the value of my impression of the work - I saw the MIT PI present on this a year ago and have read up since, but well - that's it. However, I think that they think that the main challenges are solved as per ITER and that they are on a mission to resolve the engineering; and this is the way to do that. They don't think that there is anything left which is a show stopper apart from the need to trouser $50m++ to build the proof of concept.