[timonoko]

The shell is obviously very-very thick, to stand meteor hits. So it is already gravity generator.

To achieve earth normal, maybe only some hundred kilometers will suffice, because it is made of diamond-hard super-dense material.

[timonoko]

Unlike Ringworld the Dyson Sphere cannot withstand any meteor punctures.

Entering is not so bad, because it only creates a mountain. But then you either have to let it exit or destroy it.

Exit would create a bowl with drain hole and the atmosphere will escape killing all innocent dysonians.

And destroying the meteor will cause excess of energy and we have no known method to vent it out.

[dsq]

I really liked the Ringworld, it always gave me a delicious shiver, and it was just on the edge of preposterousness but you could see how the physics could work. Not so much with a sphere.