I believe at least a few folks from Europe have assembled a DIY Magnet!
I’d suggest trying to find a store / supplier locally with a wide selection, and trying to find whatever parts they have that are closest to the ones we used. I suppose you’ll want to convert the specs on the parts we used to metric to have an easier time finding similar ones.
You may have to experiment a bit, but for most of the parts, as long as they fit inside the plastic body parts, they don’t have to be super exact.
Otherwise I imagine there must be somewhere you can order parts from online in Europe, though I don’t have specific suggestions. Maybe give these a look?
https://www.reddit.com/r/engineering/comments/1v6szd/european_mcmastercarr/