The cockpit's not piped up. I think either extending the car by 1 block either behind or in front of the cockpit could allow for the piping to reach it but it'll only be an issue on moons or mars.

Thanks Zeal, but I'm likely to decommission this one soon, and yeah I agree, it does need an O2/H2 gen

Nice little truck but it might be worth getting rid of that top connector for a O2 h2 generator. Unless this is meant to be close to something else that generates hydrogen.