However, if the earth is flat and the sun is 3000 miles away... it kinda puts a damper on the whole Dyson's sphere idea.

Also, the sun appears to be pushing through "space" (some kind of energy soup) that causes the sun to glow. And the planets are spiralling behind the sun in its wake. So, the Dyson's sphere does't really work, because the orbits are not ellipses, they are corkscrews.