Cool-looking design!
A comet is 50-70% water, and thus has a density approaching 1 g/cc (that of water). A starship is presumably made of something denser than steel (for radiation shielding, which is a function mostly of density (but also radiological cross-section, but now I'm getting too detailed)). Now let's assume a starship is two thirds empty space and one third metal; it's mean density would be the density of metal (let's say 10 g/cc) x 1/3, or somewhere between 2.5 and 4 g/cc.
Hence, when the ship nosed-in to the comet, it probably would have sunk beneath the surface and ended up under the ice.
The Ramshackle Empire existed >1100 years before the Traveller "present," so the comet might have made 10 revolutions around its primary in that time; each time some of the water would boil off, but also the whole comet would vibrate and seethe and the ship would sink deeper into the comet's gravity well - i.e., it would probably end up on the bottom.
There it would remain, hidden by the cometary ice, but visible to radar and densitometers. Depending on the geometry, only a small portion of the ship might rise from the ice, or it might be completely buried. (This is more likely - the mean comet is 5-10 km in diameter, so the ship would be under 1+ km of ice.) And if it's totally buried, your artwork might be a few pics of the comet and then switch to deep radar scans, that show the obviously artificial lines against the comet's semi-solid core.
So NOW the PCs have to work in near-zero G while carving their way through unstable ice down to the ship....talk about hostile environments....and in only a few hours/days, the comet will start outgassing....
