> But, we could always ...

That's a very bold claim with no support provided.

Pun aside, this is the more in the realm of "theoretically possible" rather than possible right now. And people don't consider sun-sized Dyson spheres impossible, so a planet-sized one should be a piece of cake.

Though the live imagery would now need night vision cameras, as we blocked out all our light with our camera support. But one has to take the good with the bad ;)

Hey, you asked me to solve your mouse problem. How was I to know you were allergic to cats!

I think most accepted approaches to constructing a sphere involve first building a series of structural components to form a stable net - as such we could stop the process when we've got just enough structure in place for stability and not so much that we need night vision cameras buuuut... I typed that before buying a bunch of night vision stock so please disregard the first portion of this paragraph - we would absolutely need night vision cameras from every angle.

Should be feasible at very high altitudes where gravity is low.

On the other hand, I think it should not be feasible. How many kilograms of raw materials would be required? And at what altitude? I don't think there's enough propellant on earth to lift that much stuff.