This is a cylinder 4 miles in diameter, and 10 miles long. While there are some living and dining spaces here, much of it is taken up by machinery.
The lower half of this cylinder has the gravity opposite that of the upper half.
The upper saucer, the upper pylon, and the upper half of the center tube have the opposite gravity of their lower counterparts.
The Bussard ramjet engines are not divided by artificial gravity. This is considered to be a design feature by the starship yard engineers.
