How will they build it?
Assuming that the EU finally settle on a design and a location; and that could be many expensive years away, how are they going to build it without hardware from non-EU countries. China, America and Taiwan are already major suppliers of the essential chips and components. India is joining the supplier party too.
It is a typical EU project that it attempting to create an EU monopoly. And, like the failed EU patent project, it will just burn Euros and time with no final result. That said, there will be lots of consultancy fees and expenses in the trough.....