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I build liquid rocket engines, and their fuel refinement systems; in a manner thats totally legal for normal (US) civilians.
for instance, did you know that your house's natural gas line is usually ~80% (varies by municipality, lowest I've seen is 74%) methane by volume, and is actually shockingly easy to purify and pressurize into usable methane for a methalox cycle engine?
its even easier to make LOX (liquid oxygen), all you need is: air (in vast supply here on lovely Terra) literally any cooler design that gets down to -183C....( the Glifford McMahon cycle works; and you can build that at home), a fractionating column, (you can buy them off the internet, you'll want metal, but glassware is still fine-ish as long as you account for thermal shrinkage....and never ever let it heat back up to room temp), a cryo-rated compressor (sold on ebay), and a dewar (also on eBay)?
This is exactly the type of incredibly niche answer I was hoping for! Its also super interesting! How did you even get into this?
I like things that go boom.
the ATF doesn't like it when I tell people how to make their own firearms though. suffice to say..... if you know how to build a rocket.... you can build a shotgun, the laws of physics are the same, just on slightly different scales.
Are you this guy?
haha; alas, no, I am not.
He did give me several ideas though. I'd be glad to call him a friend; were we ever to meet.
Haha was hoping your link would go there!