Yes, its a mid-step. They don't know exactly how to build a commercial reactor yet. The scale they've worked at so far tests the basic design but it can't bre

Yes, its a mid-step. They don't know exactly how to build a commercial reactor yet. The scale they've worked at so far tests the basic design but it can't break even (no fusion reactor has yet) or function continuously. They are going to build the minimum size that they think will achieve these goals but it will also have to be capable of testing to be able to fine tune operation. A commercial reactor wouldn't be built like that. Also, keep in mind that cost doesn't scale linearly. Likely cost goes up with the cube of the size or higher.