I don't know about the ribs, but I heard that the Russian Barbie had her lower ribs removed, and even Amanda Lepore... but both of them are crazy with plastic surgery, and I would never do it neither advice that because it's too risky and ribs cover vital organs. If you are ok to changing your body with plastic surgery I think it's better to get implants for the butt and hips, to make your ribs, waist and shoulder appear smaller, but I wouldn't do that neither, especially if it is overseas.
I don't know about the corset training, how do you get one? I mean how do you go for the size? Does it have to be smaller than your natural one? If someone did it, where did you get yours? How does it work? D: