Space Vehicle Sizing

Here are some sizes for deep space travel: [1] 5,280' X 5,280' X 5,280' [1] 50% structural / 50% opening 2,640' X 2,640' X 2,640' 18.4 Billion ft3 [2] 25% structural 1,320' X 1,320' X 1,320' 2.8 Billion ft3