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No professional experience, but there are a couple of issues I see with hydrogen powered stuff.
1 - Energy density. As noted, to have any kind of decent travel distance/run time you need to have plenty of gas with you, which means weight and lots of compression just do deal with the size. Not sure how much hydrogen is used per engine revolution but whatever amount it is at thousands of revolutions per minute it is gonna be a lot per minute of run time.
2 - getting the hydrogen to begin with. Sure, crack water with electricity. How are we going to generate all of that electricity? You mention a home unit that could produce 160ml/min but at 3000 rpms but for that to power an engine it needs to consume less than 0.054ml per revolution. That ain't a lot. Would it be better to instead store that and use direct electric power? Some type of chemical reaction? Also possible - but how do we obtain and process sufficient reactive agents in order to run the process in bulk to satisfy fuel needs?
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