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To save on mass, the ship's centrifuge is indeed a tether-based one. It has a diameter of 324 meters when deployed and is routinely retracted for crew rotations and >0.03g burns.
An annotated breakdown of the structure. With D-T being the dirtiest fusion fuel cycle, protective measures had to be taken.
With 134 km/s of dV, the Amaltheas played a key role in humanity's initial expansion beyond the orbit of Jupiter.
A closer look at the ship's frontal half. For reference, the central pressurized module is 10 meters in diameter.
A clean version of fig. 3.
