Question about Stanford Torus

I need a little bit of help with understanding some aspects of the
Stanford Torus design.

I've uploaded a diagram into the FILES section hoping that a picture
truly is worth a thousand words.

First, I'm assuming that I've drawn the Torus as the Stanford Study
described. If I've made an error, I'd appreciate anyone's
clarification.

Here are my questions.

1.) How does the rotating torus hull act as a pressure vessel when
it is bi-sected by a roof of glass? Won't atmospheric pressure blow
the two halves apart?

I know in pressure vessels here on earth, they try to avoid welds
wherever possible, instead rolling thick pieces of metal into
cyinders, spheres, and then making very difficult welds to join the
thick metal.

2.) Won't the non-rotating shell and chevrons entail a massive
reconstruction every time the habitat has to be moved into a
different orbit, or even if its orbit has to be adjusted with the
occasional boost?

3.) Mass is needed to provide radiation shielding. If the shielding
is attached to the habitat, the structure of the habitat has to be
upgraded to carry the load under centrifugal force. Wouldn't this
upgrading be primarily a matter of adding more structural support
(thicker pressure hull) thus reducing the amount of shielding
needed. Couldn't an attached shield encompass a thicker pressure
hull to carry the load of the shielding and then a cavity on the
outside of the pressure hull to stuff slag into. Wouldn't this
prevent complications inherent in moving the structure? Or is this
question a strawman I've put up to solve the problem I've posed in
question 2?