See, this might be possible, but nobody is stupid enough to try it.
...
So let me show you how I did it.
*scrolls past sections for good blueprints, questionable blueprints, and finds rediculous blueprints*
Ah, here we go.
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While that ship worked, I decided to change it up. I moved the launch pad to Deimos and used this ship, with infinite fuel (and unbreaking parts). Each segment is symmetrical, but I couldn't scroll out far enough for the screenshot.
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The build height is 160 blocks, and I have 11 segments that stack end-to-end. Thus, each launch will fold out to be 1760 blocks, or 880 meters. Again, that's per launch.
This image shows two sections put together.
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I used 2 launches per side, so 6 launches total for three sides. Then I engulfed the moon with it, muahahaha! It only took a few hours for me to move it down because of the lag.
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I had not planned to close the final side, but decided to give it a try. As soon as I launched, though, the square was gone. So while landing, the center of mass did go below the surface, that didn't seem to cause any issues. It was when I reloaded that the vessle was considered crashed and was removed from the game.
Lessons learned:
DON'T DO THIS. It's stupid and I'm stupid and my phone is stupid and it took so long to do. I proved that it can be done, why would you want to do this too? If you want to just one-up me, there are plenty of other things you can beat me in.
Capiche?
That being said, if you do want to give this a try, let me know. I'll point out some tips and things I might have done differently.