A while back I read over several other suggestions of the same thing around here. And to prove a point of how impractical the idea is, I grabbed a pre-made model off of some free site, then plugged it into Blockland.
Bottom line, it is still impractical, unnecessary, too large, and by the time it was up in the air (if possible) it would be gone from everybody's view due to the max visibility distance.
It's best use would be as a prop; and you would be much better off building it out of bricks.
