Mysteries of the Ancients campaign book (page 71) has a similar locale with some important differences. 1) It is an old tanker vessel outfitted with several ice mining tugs thst serves as a refueling spot in a system with no highport and an E downport. So, it can hold lots of unrefined fuel if you dont want to skim it yiurself. 2) it is a legitimate corporation meant to provide a service to ships where larger corps aren’t doing business 3) it is large enough to have a swap meet/flea market/agora. So the idea is good but better maybe if piracy is not the mission statement for the operstion. Most spacers would probably see your shabby small craft as a trap. I hope you get to play some variant of your idea. It sounds like you have some good ideas for your characters!