Can't find paper but I wonder if he'd taken into account near future technologies, like orbital construction (look at the IIS, that was 'built' in orbit) and fu

Can't find paper but I wonder if he'd taken into account near future technologies, like orbital construction (look at the IIS, that was 'built' in orbit) and fully reusable rockets. Anyway I do believe we need to establish a resource operation on moon just because debugging a resource operation on mars as our first space colony would be all too risky.