I had a thought regarding the radiation shielding issue I'm not sure how they calculated the mass but it seems to me if they focused on shielding the sleeping "

I had a thought regarding the radiation shielding issue I'm not sure how they calculated the mass but it seems to me if they focused on shielding the sleeping "pods" and allowed other common activities to be completed with these small areas so the crew could spend upwards of 80% of the trip in these tiny protected areas of the ship then they could greatly reduce the protection material needed...