Overbuilding doesn’t help when there is zero wind or solar generation.

Wind is usually tied across the continent and low wind in Germany usually conincides with low wind in the rest of Europe.

Please have a thorough look at https://www.smard.de and download their data to do some statistics on it. This should give you an impression of what, when and how long is missing. Hint: It's not just two to three weeks per year. There are many such gaps. And they're not just a couple of days long.

All your ideas hinge on storage that somehow magically comes to existence. I told you the numbers and you then argue with science fiction. No one knows how to build a reliable hydrogen network of the size that would be necessary. The efficiencies for generation are abysmal, especially if you try to generate just from water and electricity and not from natural gas. I don't believe you even remotely grasp the magnitude of the challenges ahead.

Again, I would like to encourage the use of real data and math. Less science fiction and wishful thinking.

Try playing around with this: https://model.energy/