How about liquid oxygen and aluminum tanks made from high-temperature electrolysis of regolith? Now you have rocket propellant and parts. 90% of the propellant

How about liquid oxygen and aluminum tanks made from high-temperature electrolysis of regolith? Now you have rocket propellant and parts. 90% of the propellant mass that Starship uses is oxygen. If you could refuel Starship in space this way, it would reduce the number of launches needed from 10 to 1 (well, maybe 2 if the lower-density liquid methane is too bulky for one launch).