As an agmantation to the store would be a shipyard at which you could safely build your ship or purchas one at it. Additonaly perhaps at tug function could be put in, in which you could drag an astroid to a ship yeard and it would mine it but with a percentige taken as payment with the rest added to a locked Plix Storge for the player to take what they wont from the astroid and sell the rest to the ship yeard. I Imagin that it could be a planitary based or a spacestion however the structer would need to be huge.