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I can't help at all with the hydrogen part, but I have a few comments for the electric assist part.
First, you need a clutch between the front prop shaft and electric motor so that the wheels will not be slowed when the electric assist is inactive.
Second, you need to synchronize the speed between the axles when electric assist is active, i.e., be sure the electric motor RPM range and front axle ratio end up covering the full range of vehicle speed attainable with gas engine power.
Finally, if you go through all this trouble, you *might* want to use an electric motor that can also function as a generator. Regenerative braking will recoup some braking energy. You will need more than just the regular "car" battery to power electric motor assist, and that extra battery needs to be recharged somehow. Just a thought... hope my $0.02 helps you.
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