What material should be used for a spaceship that doesn't need to re-enter?

What is the best material to use for a near future spaceship. Assume that most materials in the solar system can be mined and used.

The spaceship is 700m long, 500m wide and 500m high. It travels at around 1,212,062 m/s over long distances, say around 63 AU. The ship has the design shown below.

The material must be capable of keeping safe a crew without them suffering any ill consequences and should be as light as possible to save on fuel as well as being able to remain in space with only minor repairs for as long as possible (preferably at least 5 years).

The ship does not enter the atmosphere at any point but will pass through most conditions encountered in the Solar System.

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What material should be used for a spaceship that doesn't need to re-enter?

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