The bonus question is pretty easy: that space station will be either no more or it will have moved away quite a bit (or a combination of both). 5G acceleration? That's 49.0m/s/s. Given that this ship travels by emitting particles through an exhaust, the fact is that this ship moves much the same as how a rocket leaves the surface of the earth: it pushes itself away by means of particles traveling at very high speeds. So assuming an ideal world where space can be represented as a vacuum (though it is not), that ship will be exerting a continuous force equal to its own mass times 49 in Newton (5G acceleration). IOW if the ship weights 1kg, the force will be 49N. If it weighs one tonne, it will be 49kN of continuous force exerted on the space station.

... Guess what 49 tonnes of weight do to your space station when it falls/collides on top of it/head on, on earth?