I’d advise starting with Eurorack, mostly because it will be around forever as a format.
I hope AE Modular is also around forever, but it is reliant on a single manufacturer, rather than the multitude with Eurorack.
Eurorack is also very DIY friendly, it’s mostly small companies and can be as “punk rock” as you like.
You can make your own case, even out of cardboard!
You could make every module you like, either from a kit or design your own! Making the modules from kits is very easy, you just need basic soldering skills and the ability to follow instructions.

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