I dont understand why you want to use hydrogen. In your application propane will be better/ cheaper than home made hydrogen.
2 reasons, i can buy propane cylinders for $3. you can't make the same amount of hydrogen for that cheap.
Propane is very much SAFER. not safe... but safer.
Ever seen a hydrogen system suffer from a flashback? Ka-F**ing-BOOM!
EDIT: speaking from years of experience with hydrogen. You should look into propane.
Also, forget making an actual thruster.... you dont have enough money for that. if you just want the effect of a thuruster, propane will end up working better anyways.
a propane a pressurized air mix will be great.