Germany cannot be trusted
Yes, doing something big would require many things. Building a bunch of them at the same time would allow you to save many of the pitfalls of nuclear construction: having to redesign each one from scratch.
You’d build power plant factories, fifty of the same plant around the country/continent.
https://www.theguardian.com/world/2022/feb/10/france-to-buil...
Stuttgart 21 is still in construction and the Berlin airport took way longer than expected. And these projects don't have the same severe consequences if the construction is botched.
Not to mention attacks.
When you build a reactor, you probably don't want "first-timers" working on the project for you.
Given Germany's track record in screwing Europe (on top of shutting down nuclear power plants, have a look at the damage Gerhard Schroeder did) this country is dangerous to other EU members.