You can already do that. Place a fuel loader down next to a launch pad with a rocket. Fill with fuel and power it.
I second this suggestion. Mars could have ruins of ancient civilisations << this would be really cool.
Question is, why? What does it add that is different from the overworld space station? Distance isn't really a thing that actually exists in galacticraft space, so it is just as efficient to go from Mars to an overworld space station as it is to go from Mars to a Mars space station
I agree, there is really no reason to have anything else. You could use launch-controllers to send cargo rockets. I don't see a reason for any other reason for inter-planet travel.