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Where are you going to get hydrogen from? Fueling station nearby?
I could be wrong, but if you could make a DIY fuel cell, I'd think the auto makers would have mainstreamed them ages ago...if you can find one, I'd suggest harvesting all the parts you need from an existing Hydrogen powered vehicle. If you can find a cheap one, that is.
You'll probably be one of the first doing such a thing...the electrical side has been done, so you'll find plenty of help there, but the hydrogen side of things -- you'll probably be on your own or stumbling through it with minor advice on our part.
If Subaru's came in light, aerodynamic configurations, I would be pursing an AWD battery hybrid as a project. But they aren't, so the heck with that idea.
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