If humans were to build a Dyson sphere, we would use all the matter in the solar system, not just a little bit of the Earth. Except that in the Sun, of course. Jupiter alone is over 300x the mass of the Earth.
Besides astonishing physical manipulation capabilities, building such a thing would require the ability to transmute matter, changing it into other elements, and probably to manipulate matter on the nano scale in massive quantities.
Not presently known to exist material is strong enough to build into a Dyson sphere.
No presently known material is strong enough to build
Please see my post #31. It applies here as well.