hasn t the coalition gained he upper hand in the war? - and , as far as i remember, their ships didn t look like junk piles. - maybe you can make this ship a little more "high tech" looking. - as far as i remember from starlancer, their ships were quite sophisticated, too - and not at all "archaic".
about sleeper ships - unsure if the coalition would have done that. - the alliance build sleeper ships to exile itself, when they realized that they d loose the war. the coalition on the other hand was aware of winning it. so even if they knew about the alliances plans, there s little point in following the exiles ( besides, they had a blockade there to stop them - they just failed to do )
so, i don t believe the coalition had a sleepership around - maybe a ship with the capabilities to make a hyperjump aswell, but i don t think anything of the size of the sleeper ships.
what i expect them to have come to sirius is with a vessel of the size of the outcast destroyer, - which would still be used as a mainbase, either in orbit around some dead rock or fortified on some planet / moon.
all that is only guesswork and opinions of course.
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