You don't even need aerographite for that: http://www.dangermouse.net/gurps/zeppelin/vacuum.html http://www.dangermouse.net/gurps/zeppelin/vacuum.html However,

You don't even need aerographite for that: http://www.dangermouse.net/gurps/zeppelin/vacuum.html http://www.dangermouse.net/gurps/zeppelin/vacuum.html However, you need a material strong enough not to implode due to the outside pressure of air. Not sure how good material tech is for that. Even if it were strong enough, you would have constant "leaks" of air into the vacuum cells. So you would need a vacuum pump working all the time. Still might be worth it, though.