I am not surprised no one has done it. The tree would be very small to begin with. How would you prune it? You can't keep taking it out. No sorry, stick to Tillandsias or orchids or any other small plant but it is not for bonsai
this was my reply
OK... the only posts after the above were from Leatherback:
"Main problem I would see is drainage. Of course, you could find a globe with drainage holes in it."
And Bob, who ideas mostly seem not his own, but a confirmation of those of others:
"yes, it would be fine, as long as there is a hatch, so you can prune it and water it"
So, what exactly was it that made you write: "I have never heard anything so stupid" ?
Was that the idea of drainage, or a hatch ?