Is it possible with the vanilla KSP to just keep adding onto an original base or station to fulfill a contract? Say I put a previous station in orbit for a contract that required power, antenna, research station and 5 kerbals. I have another contract later to put a station up requiring a solar panel, antenna, research station and 9 kerbals. Could I just make up the difference by adding a module to support an additional four kerbals to the first station?