Yeah, it can, actually. You use the regular rules, then apply the Dirigible (semi-rigid) template to it, then buy enough tons of lift to fully lift it off the ground
But for some reason, you can't build Dirigibles that just use gas (or hot air) for lift (says rigid dirigibles have a 75% of total weight limit. Which is odd).
So you can build giant hot air balloons, but no Hindenbergs...