It would be challenging to have a missions option. Just a few Ideas:
1. Build an orbital I am on transport, Vanland a surface rocket before heading mars. In this option, as well as others, taking off from other planets besides earth, this includes the moon, would mean first landing supply drops, and mine. Followed by creating a construction platform.
Have an authentic Apollo moon landing mission, but you would need to have two command Pods in the same rocket configuration.
Land a base on Haleys comet, might need some ice picks for this :)
Put a 1 million kg Space station in marsian orbit, using the moon or its orbit to construct and launch.
Put an vessel in orbit around alpha Centauri. Having a second solar system with a trying every star, as possible
I have several others, but I'm sure but the fans and programmers of this incredibly awesome game, will have many many others. It would also be great, I have a game proportioned actor is well. I assume this would take a lot more memory, as a three dimensional environment now be 10 times as large.