Quote from MineCrak
Thank you for replying so fast! You've definitely answered all my questions, pardon my inability to explain what I need.
I understand you can change the 'height limit' in Zeppelin's cfg file, but with vanilla worlds. The world height is 128? (forgive me if I'm wrong) and the config is limited to 128 because the world y limit is prevent more blocks from being placed if you get what I mean, Zeppelin will not be able to move the craft upwards beyond the limit. I was warned about increasing the figure because I might run into issues/crashes or even corruption to the save file. And it's safer to just use Cubic Chunks.
Anyway. I guess I'll wait for the 1.8 release before I tinker with it. Great response, cleared issues up for me because I was abit confused with the OP to start with. Thanks!