...almost impossible today on earth, but without lawyers simple on mars. Be sure to watch video. Note construction about a third of the way in. I proposed something very similar for mars. You start with a 10x10x40 m trench. You cover it the same way they do in the video with a curved metal (iron is 15% of mars dust) surface covered with dirt (rather than snow.) Then you finish the inside. You weld metal rather than nail wood (well, until the wood has been grown which does not take that long with the right type of wood.)
I'm convinced. Thirteenth colonist on first landing should be Siberian Husky pup named Lucky. If you're looking at the scale of this being done by the army in Iceland and thinking we could never do this on mars, then you're looking at it the wrong way.
The difference is that a dozen colonists with two tractors in the first 26 months will not be able to do this to the same scale. But that does not matter. What matters is that they will be able to do what they will be able to do. Which is, create comfortable habitats that allow even more shirtsleeve work to be done. This is why four colonists is too few. I see a dozen as a minimum followed by multiple dozens on the second and subsequent landings.