Just a note about shielding & alternative spin gravity concepts:

If you just spin two masses connected by cables, the shielded area can possibly be much smaller, reducing shielding weight or enabling better shielding for the same mass.

Also you could more easily add living space & shielding incrementally, as long as you keep the two cable connected masses roughly balanced. With a ring type station/habitat, you need the whole thing (or at least most of it) complete before you get any benefits.