The Oasis could be simulated with a Space Station, cost you 2500 minerals + hullcost to build, 300 per turn to maintain. Not bad.
These things supply a whole system, too.
Still, a good idea. You may want to just quickly throw together a disposable resupply depot station
Consider it added.
[This message has been edited by suicide_junkie (edited 04 April 2001).]