In Empyrion I spawn 10 large ships and I don't notice any problems.
Problems can only be in multiplayer, there is a limit on the number of ships on the palanet.
I am not asking to make ships,
but only a rocket like in Stationeers, which will help you move from one card to another card. it's only 3 cubes. engine tank and cockpit.
If we remove all the animals and plants from the desert and paint the sky a little beige, we change the temperature. And remove the water. this is Mars.
And now just change the color of Mars to gray and set the night sky here and the moon. I don't see anything complicated here.
Just don't want to develop 7 Days in this direction?
Another question is to make it all interesting, but it needs to make an effort.