As I have commented elsewhere, the building techniques for the Starship are primitive and will not achieve the goal of a unit that can readily do continuous service for years. Elon is a genius on materials and design, but as in the original factory for the Tesla, he is just learning about manufacturing. A Starship factory will be a whole new level.
The current Starships are not going to meet his weight, strength and durability goals. And, most important, the current techniques are slow and error prone, which makes them uneconomic. I want the Mars colony as much as he does, even if I will not be able o survive the trip. Our species needs a restart, a safety valve, and a respite if one of the many possible disasters strikes Earth.