By beanstalk, do you mean space elevator? Those might work on the Moon where there's no atmosphere or terrorists.
The informed criticism is 'How do you beam power that far'. My own question is how does the one going up pass the one going down.
The gold/milk protein composite is a weird thing. I'd like to see a means of making an arbitrary shape in gold aerogel and then sputtering the boron carbide onto it's surface and infusing it with the gold 3% aluminum alloy.
If you made a gold knife blade, the only thing that would hone it is Q-carbon?