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(edit: click image to enlarge)
1- Engines. Mounted forward of the rest of the ship on booms to save mass. Thrust stream is angled outward 2 degrees to prevent damage to the ship.
2- Fuel tank. Holds fuel- not much else to it.
I'm not so sure of the design of the fuel tanks at the moment, so I may change them.
3- Reflective shields. Reflect thermal radiation from the engine exhaust.
4- Tensionary truss. Having major structural aspects of the vehicle in tension reduces mass. It could be a tether, but a truss adds rigidity for rotational and translational manoeuvres.
5- Docking node. Able to accomodate two DG type vessels or two XR2s.
6- Transfer tunnel. Allows transfer from the docking node to the habitation module. Also acts as a truss.
7- Habitation module. Able to house 14 people.
The spacecraft has a maximum operational velocity of around 200 km/s, and a overall Delta v of around 500 km/s. Maximum acceleration while under thrust will be 1-1.5 G.
The spacecraft is designed to spin along the X axis while in the cruise phase of the flight. This produces artificial gravity, and is known as a "tumbling pidgeon" arrangement. The Orion spacecraft was designed to generate artificial gravity this way, and an (unintentional) example can be seen in 2010, when the Discovery spins end-over-end. Usually this incurs odd arrangements of crew and cargo (the direction of acceleration during thrust and the direction of acceleration during spin are opposite eachother). However, here the direction of acceleration during thrust and spin is the same, which is a benefit of having the engines in front of most of the spacecraft structure- the engines and fuel tanks act as a counterweight to the habitation module.
Cheers.
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